[disksing]

Summary

• add API V3 keyspace identity plumbing for txnkv clients
• add a V3 codec that uses physical prefixes for PD region routing while sending user keys plus KeyspaceIdentity to TiKV RPCs
• expose V3 codec/PD constructors and focused codec tests

Validation

• go test ./internal/apicodec ./internal/locate ./txnkv

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Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
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Needs approval from an approver in each of these files:

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[ti-chi-bot]

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

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The list of commits missing DCO signoff:

• 8a3e407 Update APIV3 PD and kvproto dependencies

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