<!-- Describe what has changed in this PR -->
**What changed?**
Add two new flags to activity heartbeat response:
* reset_requested // indicates that reset happen while activity is still
running
* reset_heartbeat //indicates that user asked to also reset heartbeats

<!-- Tell your future self why have you made these changes -->
**Why?**
Product request.

<!-- Are there any breaking changes on binary or code level? -->
**Breaking changes**
No

Corresponding Server PR:
temporalio/temporal#7677

<!-- Describe what has changed in this PR -->
**What changed?**
Removed all copyright headers from individual files.

<!-- Tell your future self why have you made these changes -->
**Why?**
Per-file license no longer needed

Closes #583

<!-- Are there any breaking changes on binary or code level? -->
**Breaking changes**
Comment only change

<!-- If this breaks the Server, please provide the Server PR to merge
right after this PR was merged. -->
**Server PR**

* Remove copyright headers from code

* Remove copyright header from proxy generator, ingest api changes

_**READ BEFORE MERGING:** All PRs require approval by both Server AND
SDK teams before merging! This is why the number of required approvals
is "2" and not "1"--two reviewers from the same team is NOT sufficient.
If your PR is not approved by someone in BOTH teams, it may be summarily
reverted._

<!-- Describe what has changed in this PR -->
**What changed?**
Add activity options to the pending activity info

<!-- Tell your future self why have you made these changes -->
**Why?**
If activity options where changed - there is no "official" way to users
to know what are the current options.
UI should display current options, so we will provide them as a part of
DescribeWorfklow response.
Thus we add activity options to the pending activity info, which will be
a part of DescribeWorfklow response.

<!-- Are there any breaking changes on binary or code level? -->
**Breaking changes**
No

…ide (#579)

_**READ BEFORE MERGING:** All PRs require approval by both Server AND
SDK teams before merging! This is why the number of required approvals
is "2" and not "1"--two reviewers from the same team is NOT sufficient.
If your PR is not approved by someone in BOTH teams, it may be summarily
reverted._

What changed?
- Make override a one of and add different pinned override types.
- Change version from string to struct
- Make nil Version represent "send tasks away from versioned workers and
to unversioned workers"

Why?
- To prevent misconfiguration and to expand the override definition to
accommodate the new PinnedUntilContinueAsNew behaviors.
- Using a string to represent structured data, whose subfields
frequently need to be considered separately, is brittle and not good for
anyone using it. Struct is better.
- "unversioned version" is contradictory, and nil is a nice way to
represent that the versioning story of a task queue is no longer in the
control of the Deployment whose `RoutingConfig` you are reading.

<!-- Are there any breaking changes on binary or code level? -->
Variables are being deprecated, but the content of the code is not
changing.
The idea of "Unset Ramp" having a separate meaning from "0% Ramp" is
removed. 0% ramp now is the only way to have "no ramp" / 100% of traffic
going to Current Version. Nil `ramping_deployment_version` + non-zero
`ramping_version_percentage` is the way to ramp traffic to unversioned
workers.

The SDK interface for this could look like:
```
deployment := client.GetHandle(deploymentName)

// set current to a version
deployment.SetCurrentVersion(buildId) -> current set to deploymentName/buildId
deployment.UnsetCurrentVersion() -> current set to nil

// set current to unversioned
deployment.UnsetCurrentVersion() -> current set to nil

deployment.SetRampingVersion(buildId, 50) -> ramp set to (deploymentName/buildId, 50)
deployment.UnsetRampingVersion() -> ramp set to (nil, 0%)
deployment.RampToUnversioned(50) -> set to (nil, 50%)
```

<!-- If this breaks the Server, please provide the Server PR to merge
right after this PR was merged. -->
**Server PR**

---------

Co-authored-by: Spencer Judge <spencer@temporal.io>
Co-authored-by: Shahab Tajik <shahab@temporal.io>