Support _request_timeout in dynamic client watch()

[thev1ndu]

What type of PR is this?

/kind feature

What this PR does / why we need it:

DynamicClient.watch() accepts a timeout (the server-side timeoutSeconds) but gives no way to set a client socket timeout. The regular client watch already supports _request_timeout. This adds the same parameter to the dynamic watch and forwards it to Watch.stream(), so a stalled connection can be bounded on the client side.

Which issue(s) this PR fixes:

Fixes #2533

Special notes for your reviewer:

Added a unit test in client_test.py that checks the value reaches the watcher.

Does this PR introduce a user-facing change?

Dynamic client `watch()` now accepts `_request_timeout` and forwards it to the underlying watch stream.

[kubernetes-prow]

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• d88107a Support _request_timeout in dynamic client watch()

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[kubernetes-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: thev1ndu
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