…eipt events

…Factory

added required arrayNode item "subscriptionId" to EventMessage encoder
fixed CanonicalAuthenticationMessage decoder

…zation condition

…ance to use and since the client API doesn't directly support relay responses, i've added a small/simple/useful client implementation leveraging springframework WebSocketClient atop reactive-streams, composed of 4 parts:

implementation:
	1) dependencies added to nostr-java-api pom.xml:

	springframework dependencies:
		spring-websocket
		spring-webflux
	and reactor dependency:
		reactor-netty-http

	2) small/simple WebSocketClient reference implementation, in files:

		nostr-java-client/src/main/java/nostr/client/springwebsocket/SpringWebSocketClient.java
		nostr-java-client/src/main/java/nostr/client/springwebsocket/WebSocketClient.java
		nostr-java-client/src/main/java/nostr/client/springwebsocket/WebSocketHandler.java

	3) minimal/tiny changes to current codebase for spring websocketclient integration
		- class Nostr public method signatures cloned into interface NostrIF
		- class Nostr now implements NostrIF
		- added class NostrSpringWebSocketClient, also implements NostrIF  (this class wraps Spring WebSocketClient reference implementation mentioned above)

	4) class EventNostr formerly:
		public abstract class EventNostr<T extends GenericEvent> extends Nostr
			now
		public abstract class EventNostr<T extends GenericEvent> extends NostrSpringWebSocketClient

	all remaining nostr-java classes/heirarchiess/calls/etc remain unchanged

testing:
	2) ApiEventTest methods that send events to relay have been supplemented with callback logic, i.e.,:

			await().until(() -> Objects.nonNull(nip01.getRelayResponse()));
			nip01.close();

…d json correctness

… independent)

… independent)

various updated files, new files and test classes, categorized and described below:

updated files/classes:
	pom.xml
		jdk 21

	BaseEvent.java
		removed superfluous/unused internal ProxyEvent

	Nostr.java
		now implements NostrIF interface (for pluggable/polymorphic client implementations)
		send() methods now returns List<String> (relay response) instead of void

	Kind.java
		added
		PRODUCT_CREATE_OR_UPDATE(30_018, "create_or_update_product"),
		CALENDAR_DATE_BASED_EVENT(31_922, "calendar_date_based_event"),
		CALENDAR_TIME_BASED_EVENT(31_923, "calendar_time_based_event"),

	GenericEventDecoder.java
		added additional constructor accepting clazz customization parameter

	IdentifierTag.java
		added polymorphic deserialize() method

	TagDeserializer.java
		added IdentifierTag to switch case

	ClassifiedListing.java
		added builder
		added jsondeserialize using builder

	ClassifiedListingEvent.java
		added builder
		added jsondeserialize using builder
		added custom tag mapper

	ZapReceiptEvent.java
		added validate() method

	ZapRequestEvent.java
		added validate() method

	nostr-java-client/pom.xml and nostr-java-test/pom.xml
		added spring dependencies for:
			jakarta.websocket-api
			jakarta.websocket-client-api
			spring-websocket
				standard websockets
			spring-webflux
				reactive websockets
			reactor-netty-http
				reactive websockets

	nostr-java-event/pom.xml
		removed googlecode openbeans, use already available java.beans instead

	java.net.URL updated to java.net.URI in classes:
		NIP12.java
		NIP12Impl.java
		ReferenceTagSerializer.java
		ReferenceTag.java

----
new classes:
	NIP52.java
	NIP52Impl.java
	NIP52Event.java

	CalendarTimeBasedEvent.java
	CalendarContent.java

	NostrIF.java
		abstraction for pluggable client implementations, ex:
			Nostr.java
			NostrSpringWebSocketClient.java
	NostrSpringWebSocketClient.java
		SpringWebSocketClient implementation

	ReactiveWebSocketClient.java
		web-socket w/ reactive streams
	StandardWebSocketClient.java
		standard web-socket (non-reactive)

	WebSocketClient.java
		base interface contract for client implementations

JsonComparator.java
	utility class for tests

new test classes, self explanatory:
	ApiEventTestUsingSpringWebSocketClientTest.java
	ApiNIP52EventTest.java
	ApiNIP52RequestTest.java
	ApiNIP99EventTest.java
	ApiNIP99RequestTest.java
	CalendarContentDecodeTest.java
	CalendarTimeBasedEventTest.java

----
test/example classes:
	NostrApiExamples.java
		updated to receive relay responses

…nal classes changed (EventNostr.java and GenericEvent.java)- as well as minimizing changes in each file- descriptions/motivations for said changes are as follows:

~~~~
(newly introduced) interface NostrIF.java
	created to support pluggable client implementations

	existing class Nostr.java now implements NostrIF
	new class NostrSpringWebSocketClient.java implements NostrIF

~~~~
(updated) class EventNostr.java

to demonstrate relay event responses to a websocket client, EventNostr.java now extends NostrSpringWebSocketClient.java instead of Nostr.java (which, in it's current state, does not handle relay responses)

	background: per NIP-01 section [From relay to client: sending events and notices](https://github.com/nostr-protocol/nips/blob/master/01.md#from-relay-to-client-sending-events-and-notices):
		OK messages MUST be sent in response to EVENT messages received from clients

	indicating that previously defined EventNostr.java send(...) methods had (incorrect) return type T (where <T extends GenericEvent>):
		public T send()
		public T send(Map<String, String> relays)
		public T signAndSend()
		public T signAndSend(Map<String, String> relays)

	thus have been updated to instead return (correct) return type OkMessage
		public OkMessage send()
		public OkMessage send(Map<String, String> relays)
		public OkMessage signAndSend()
		public OkMessage signAndSend(Map<String, String> relays)

~~~~
(updated) GenericEvent.java
	added protected methods:
		addStandardTag(...)
		addGenericTag(...)
	available to classes extending GenericEvent which require customized tag mapping.  examples of their use can be seen in:
		CalendarTimeBasedEvent.java
		ClassifiedListingEvent.java
	with remaining classes extending GenericEvent left unaffected unless/until such time custom mappings are useful/necessary for them.

~~~~
(updated) ApiEventTest.java
	tests calling instance.xyz.send() now receive relay responses

~~~~
relays.properties
	if useful/helpful, [superconductor nostr relay](https://github.com/avlo/superconductor) is available for use (and is built atop nostr-java).  please see its [README](https://github.com/avlo/superconductor) for instructions and feel free to reach out to me for assistance if needed.

updated BaseMessage encode() with Optional.ofNullable(subscriptionId)

…entTest.getRelays(), which uses relays.properties

test now iterates for each URI in map

…llable()

…pdate for its create() method

…elay implementations may behave differently.