tikvrpc: support TiCI estimate count RPC

[wshwsh12]

Summary

• Add tikvrpc command support for GetEstimateTiCICount.
• Update kvproto dependency to the TiCI estimate count branch.

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[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: cfzjywxk, gengliqi

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Details

Needs approval from an approver in each of these files:

• OWNERS [cfzjywxk,gengliqi]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2026-04-27 09:59:54.140126731 +0000 UTC m=+2591999.345486788: ☑️ agreed by cfzjywxk.
• 2026-04-27 11:43:09.954239236 +0000 UTC m=+2598195.159599293: ☑️ agreed by gengliqi.

[wshwsh12]

/retest