feat: add commit info to getVersion

[GabrielePicco]

Greptile Summary

This PR enhances the getVersion RPC endpoint by adding git commit information and extending the version response structure. The changes involve four main components:

1. New git-version dependency: Added to magicblock-version/Cargo.toml to enable compile-time git commit hash extraction using the git_version::git_version!() macro.

2. Enhanced Version struct: Modified magicblock-version/src/lib.rs to include a new solana_core field for tracking the underlying Solana version, updated commit computation to use the git-version macro instead of environment variables, and changed the default client identifier from SolanaLabs to MagicBlock.

3. Extended RPC response structure: Created a new RpcVersionInfoExt struct in magicblock-rpc/src/traits/rpc_minimal.rs that provides more detailed version information including separate fields for solana-core version, feature-set, git-commit (as hex string), and magicblock-core version.

4. Updated RPC handler: Modified the get_version method implementation in magicblock-rpc/src/handlers/minimal.rs to return the new extended version info structure, formatting the git commit as an 8-character hexadecimal string and properly populating all version fields.

[greptile-apps]

_{4 files reviewed, 3 comments}

_{Edit Code Review Bot Settings | Greptile}

[lucacillario]

LGTM

[Dodecahedr0x]

Small nit but otherwise LGTM