Is there an existing issue for this?

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What happened?

We need to find a way to exclude files when generating protos with buf.
For instance, we want bank protos v1beta1 and v2 to be in the same buf modules.
However, bank v2 will support handlers, and do not require grpc gateway file to be generated (#20798)

We should figure out a way how to exclude files from buf in the buf.yaml (https://github.com/cosmos/cosmos-sdk/pull/21659/files#diff-50e488c6e15cfeba84c617c17b6c9f0e04ea2d65a855c97e0d2fa74f130e15a7R6-R8).

I am not sure if it is supported, but we need it ref: bufbuild/buf#224 and #21659

Cosmos SDK Version

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