…0.4 (#1630)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

* New Channel interface

I haven't yet hooked this up to Socket, but I intend to
in a follow-up PR.

* apiDump

* Use the word Socket instead of Channel

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

* New concrete implementation of okio.Socket

This turned out to be much trickier than I had expected.
The default java.net.Socket inputStream and outputStream
close the entire Socket when they are closed. This offers
different behavior - the two streams are closed independently.
When both are closed the socket is closed and its resources
are released.

* Don't create a Socket sample

This was just to confirm the Java API worked
as intended.

* Also test pipes

* Fix names to support setting multiple bits

* apiDump

* Suppress a ktlint bug

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Co-authored-by: Jesse Wilson <jwilson@squareup.com>

Migrate to Sonatype Central Portal

* New API, inMemorySocketPair()

I'm using Array<Socket> instead of Pair<Socket, Socket>
because Array is _slightly_ more friendly to Java-language
consumers.

* apiDump

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Co-authored-by: Jesse Wilson <jwilson@squareup.com>