feat: add go client

[sonicfromnewyoke]

Problem

The repo ships first-class SDKs for Rust (yellowstone-grpc-client) and Node.js (yellowstone-grpc-client-nodejs), but Go users only had examples/golang - a raw grpc-go + proto copy with no library.
Every Go consumer had to reimplement TLS setup, x-token/x-request-snapshot injection, keepalive defaults, endpoint parsing, health checks, etc. and vendor their own generated proto.

Summary of Changes

• New library yellowstone-grpc-client-go with:
• Builder + Client mirroring the Rust
• Typed wrappers for every unary RPC + Subscribe / SubscribeDeshred
• HealthCheck / HealthWatch against geyser.Geyser
• Auth injected via Chain* interceptors so user dial options can't clobber it

supress #728

cc @fanatid @linuskendall

[leafaar]

Niceee

[WilfredAlmeida]

Hi @sonicfromnewyoke love the contribution. Can you add an action to run tests, build/compile the SDK if needed, and run the examples as a form of integration tests?

I'll go through the code in the meanwhile.

Thanks again!

[sonicfromnewyoke]

Can you add an action to run tests, build/compile the SDK if needed, and run the examples as a form of integration tests?

added tests step in CI for go-client and alternative vtproto, because a canonical one uses reflections (not suitable for geyser load)