move sdk to another repo

[kroos47]

Pull Request type

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• Feature
• Bugfix
• [ ✔️ ] Refactor
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Description

Moving the avail-go-sdk to a new repo as we need to publish it the packages with a new tag

Related Issues

Testing Performed

Checklist

• [ ✔️ ] I have performed a self-review of my own code.
• The tests pass successfully with cargo test.
• The code was formatted with cargo fmt.
• The code compiles with no new warnings with cargo build --release and cargo build --release --features runtime-benchmarks.
• The code has no new warnings when using cargo clippy.
• [ ✔️ ] If this change affects documented features or needs new documentation, I have created a PR with a documentation update.