Avoid requirining new `pyfunction`s to be declared in `lib.rs`

[IvanIsCoding]

This is a very big refactor trying to tame lib.rs. Essentially we create a macro to avoid having to add m.add_wrapped(wrap_pyfunction!(your_new_function))?; every single time.

This will make it simpler for new contributors to add new methods, as now it is more likely they do not have to change lib.rs. If a new module is needed, the diff is similar but future contributions remain simple.

[coveralls]

Pull Request Test Coverage Report for Build 10675942525

Details

• 29 of 29 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.03%) to 95.783%

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Totals
Change from base Build 10672676557:	-0.03%
Covered Lines:	17897
Relevant Lines:	18685

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💛 - Coveralls