[Feature Request] Implement deprecation warning as compile time warning or docstring standard

[martinvuyk]

Review Mojo's priorities

• [X] I have read the roadmap and priorities and I believe this request falls within the priorities.

What is your request?

something like having either a decorator @warnings.deprecated() or a docstring standard

What is your motivation for this change?

Having the ability to do it per arg and having a descripcion would be amazing long term

Any other details?

No response