[Suggestion]: Add anchor-gen and support it.

[SushantChandla]

One common issue I’ve noticed when building on Solana is the frequent version compatibility problems. For instance, if I have an AMM and want to integrate some of Raydium’s code into my program, I often need to downgrade to the Solana and Anchor versions that Raydium uses. This makes Cross-Program Invocation (CPI) very challenging.

I discovered that the anchor-gen package by Saber HQ can help solve this issue. It allows users to generate a client for CPI that matches the specific Solana and Anchor versions they're using. I believe this feature would be a great addition to the official Anchor repository, and Anchor should manage it going forward.

In its current state, the anchor-gen project doesn’t fully support the latest Anchor versions, but I think integrating this functionality into Anchor would be a great move for the ecosystem.

[SushantChandla]

A similar project from anchor to generate anchor clients for cpi and account deserialization is what I am looking for.

[acheroncrypto]

Anchor supports this feature natively since v0.30, see:

• https://www.anchor-lang.com/release-notes/0.30.0#dependency-free-program-declaration
• https://docs.rs/anchor-lang/0.30.1/anchor_lang/macro.declare_program.html
• lang: Add declare_program! macro #2857