Summary

This issue is only concerned with the spec/implementation of ProcessProposal.
Synchronize spec and implementation (two PRs may need to be open)

Problem definition

Generate protobufs with the latest ABCI++ spec of ProcessProposal in the spec repo (its v0.36 branch).

Once the protobufs are synchronized, we need to adapt the code in the consensus logic.

Dependencies

#7735

For Admin Use

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