Auto-generate Rust program structures / client from IDL

[gitmalong]

Hi!

Some projects do only provide an IDL or js client. Rust users have to manually create struct's based on the IDL in order to interact with the program. It would be very neat to generate such clients automatically from an IDL json file.

Thanks

[Arrowana]

https://github.com/saber-hq/anchor-gen

[billythedummy]

https://github.com/igneous-labs/solores

[jordy25519]

for offchain clients based on anchor-gen: https://github.com/jordy25519/drift-account-indexer/tree/main/src/idl-gen

[acheroncrypto]

Added in #2857

[luca992]

Are there any examples of how to use this #2857 @acheroncrypto ? It's really not documented at all and I can't find a simple standalone example of how to parse some instruction data in minimal project anywhere.