Add API V3 keyspace identity to PD client

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Supersedes #10915. Recreated after normalizing the head branch name to apiv3.

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Thanks for your pull request. Before we can look at it, you'll need to add a 'DCO signoff' to your commits.

📝 Please follow instructions in the contributing guide to update your commits with the DCO

Full details of the Developer Certificate of Origin can be found at developercertificate.org.

The list of commits missing DCO signoff:

• 425af43 Update APIV3 kvproto dependency
• 9d45423 Fix APIV3 keyspace meta compatibility in client
• a8622f6 Update APIV3 kvproto AutoID compatibility
• 74035db fix: adapt pd server to keyspace proto oneofs

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