build(proto): replace buf-generate by tonic_build

[SuperFluffy]

Summary

Replaces buf generate by tonic_build to generate rust code from protobuf.

Background

buf generate relies on the third party plugins protoc-gen-prost and protoc-gen-tonic, which are not yet updated to prost-build 0.12 and tonic-build 0.10 (and hence prost 0.12, tonic 0.10).

This patch moves code generation away from the buf generate executable to the Rust tonic-build crate, because we need to update prost/tonic and because these projects do not guarantee that code generated with older versions work with newer versions.

Changes

• Replace invoking the buf generate executable by using tonic_build directly
• Use buf build to create a file descriptor set that can be fed into tonic_build (the latter skips its own invocation of protoc)
• Clean the generated code by removing all files that are not prefixed with astria. (tonic also creates client and server code for tendermint abci; I am not sure why, probably due to the descriptor set)

Testing

Not tested directly; this should not affect the actual code generated. Everything should still compile, all tests should pass.

Related Issues

PR requiring a newer version of penumbra and hence prost: #579

PR againast protoc-gen-prost: neoeinstein/protoc-gen-prost#78

[SuperFluffy]

The *.tonic.rs files have been absorbed as modules directly into their parent files (these were include!ed previously I believe)

[noot]

looks good! so are we still using buf for handling dependencies, but tonic for the actual build?

[SuperFluffy]

looks good! so are we still using buf for handling dependencies, but tonic for the actual build?

Yeah, so buf fetches the the tendermint protos as defined in astria-proto/proto/buf.yaml. and then compiles our protos + the tendermint protos it just pulled, emitting a file descriptor set. We then feed this set into tonic-build.

My understanding is that tonic-build would usually invoke protoc, which would also result in that file descriptor set. But we .skip_protoc() because we want buf to deal with proto-dependecy resolution.

This way we avoid having to vendor tendermint.