feat: support dynamic attester set updates

[randygrok]

Summary

• enable MsgJoinAttesterSet and MsgLeaveAttesterSet to update the active attester set
• store height-scoped attester set snapshots and use them for attestations, signatures, /commit, /validators, and queries
• make attester clients re-check membership per height before submitting votes
• keep genesis export aligned with the active attester set

Testing

• git diff --check
• go test ./... -count=1

Notes

• Generated protobufs with system buf because make proto-gen currently fails locally with undefined: quic.EarlyConnection.

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