feat: make `get_solc_version()` method public

[antazoey]

What I did

I would like to use the get_solc_version() and not worry about it breaking due to it being private. This PR intends to include the changes needed to accommodate that.

How I did it

• Remove implementation to method withou underscore
• Add method with underscore back to point to method without underscore (just in case)

How to verify it

Let me know if it would be ok to make this change.

Checklist

• [ ] I have confirmed that my PR passes all linting checks
• [ ] I have included test cases
• [ ] I have updated the documentation (README.md)
• [ ] I have added an entry to the changelog