Go-SDK aligning with other SDK

[kroos47]

Pull Request type

Please add the labels corresponding to the type of changes your PR introduces:

• [ ✔️ ] Feature
• Bugfix
• [ ✔️ ] Refactor
• Format
• Documentation
• Testing
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Description

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.

[Leouarz]

Overall looks good to me, some small nits in comments and here :

• There still a GO example in the old folder that needs to be deleted
• The new folder structure is avail-go -> examples -> go-examples, the last folder can be removed
• Is it possible to keep same naming convention for example files (all lower case with '_' as separator ?
• Some function names start with uppercase and some with lowercase, would be great to be consistent