Add API V3 keyspace identity support

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Supersedes #2011. 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:

• 8a3e407 Update APIV3 PD and kvproto dependencies
• c99d77c Encode API V3 RPC keys with physical prefix
• f310eb8 apicodec: keep API V3 RPC keys logical
• 4a85e90 apicodec: keep API V3 region keys logical
• 00b316e apicodec: bound API V3 region scans to keyspace
• 875a685 apicodec: fix API V3 physical keyspace prefix
• 73ea742 apicodec: clamp API V3 bucket keys to keyspace

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