Request: Make convert available in client as feature or in a utility crate

[luca992]

v12 removed the convert feature from yellowstone-grpc-proto

This was actually pretty useful client side in my project when using yellowstone-grpc-client, as I could directly convert a transaction to the standard solana transaction type without having to make a rpc request to get the transaction by hash.

It would be nice if it was exposed again outside of yellowstone-grpc-geyser as a utility as that crate is very heavy.

[leafaar]

Hey, we had to do that because we started using custom patches and we didn't want people having to rely on that. I think it might be possible to expose those without the patches.