Mark Cython functions as noexcept

[sebp]

Checklist

• [x] pytest passes
• [x] tests are included
• [x] code is well formatted
• [x] documentation renders correctly

What does this implement/fix? Explain your changes Marks Cython functions as noexcept to release the GIL.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (92119ee) 98.04% compared to head (11fd856) 98.04%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #418 +/- ## ======================================= Coverage 98.04% 98.04% ======================================= Files 37 37 Lines 3426 3426 Branches 517 517 ======================================= Hits 3359 3359 Misses 32 32 Partials 35 35 ```

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