Watch: add typing information

[mr-c]

What type of PR is this?

/kind cleanup

What this PR does / why we need it:

The Kubernetes Python client advertises itself as being typed, but kubernetes.watch.watch was untyped.

Special notes for your reviewer:

Does this PR introduce a user-facing change?

NONE

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: mr-c / name: Michael R. Crusoe (2373c29)

[kubernetes-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: mr-c
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[kubernetes-prow]

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