Add Stats to DescribeWorkerDeploymentVersion

[stephanos]

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?

(1) Deprecated task_queue_infos in deployment.WorkerDeploymentVersionInfo.
(2) Added version_task_queues to DescribeWorkerDeploymentVersionResponse.

Why?

We want to report task queue stats for each task queue that is part of a worker deployment version.

The challenge is that the taskqueue package depends on the deployment package. So adding TaskQueueStats to deployment.WorkerDeploymentVersionInfo causes a cycle import error.

Weighing our options, we decided to effectively move the task queue-related data from within the deployment package into the response message.

Breaking changes

Not yet; but in subsequent releases the deprecated field task_queue_infos will be removed.

Server PR

temporalio/temporal#7959 (draft)

[cretz]

LGTM from a syntax POV, but will defer to other SDK team members more familiar w/ versioning. I admit I don't understand VersionTaskQueueInfo vs VersionTaskQueue and such.

[stephanos]

FWIW, VersionTaskQueueInfo is just an arbitrary label; it wasn't used anywhere else. Same thing goes for VersionTaskQueue. I'm just trying to express "details of a versioned task queue".

[stephanos]

Update: I just added report_task_queue_stats since I realized it was missing.