Follows from #7975.

At the moment, when we generate stubs from the .proto files under proto/tendermint, the generated code breaks the Tendermint build.

I've manually scoured the histories of both the (now archived) spec repository and the Tendermint repository, and I can't yet find a specific point in any branch's history where there's a coherent set of .proto files that can result in a working build. As such the only remaining option is probably to manually patch the .proto files until we get it all working (and, ideally, in line with the most recent spec work).

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