Refactor proc macros into v2

[ericnordelo]

Fixes #1485

PR Checklist

• Tests
• Documentation
• Added entry to CHANGELOG.md
• Tried the feature on a public network

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[immrsd]

Left a couple of comments
Also, could you explain the idea behind removing all the comments from the generated code?

[immrsd]

I believe the implementation with ByteArray literals instead of felt252 literals won't be able to compile
Can we add a check that all the generated contracts compile without issues?

[ericnordelo]

It won't, but we don't need them to compile here, we just need the macro to generate the correct code. We don't need to add a check for compilation, since the macro is not in charge of that.

Note that using a ByteArray is a temporal solution until the proc macro bug of not accepting shortstrings gets fixed.

[immrsd]

Same issue with literals of a wrong type here

[ericnordelo]

Also, could you explain the idea behind removing all the comments from the generated code?

Sadly it is not intentional, but the quote! macro does remove them automatically. Haven't found a solution for it yet, but since we need to refactor to use proper Text Spans for v2, maybe (hopefully) that would solve the issue with comments as well.