Allow setting the module name for a pyclass

[althonos]

Following #474, this PR adds an argument for #[pyclass] that lets the user specify the name of the module the class is part of. I also added the right module for all builtin types (either builtins or datetime), with a few tests.

Maintenance

• Run cargo fmt (This is checked by travis ci) ✅
• Run cargo clippy and check there are no hard errors (There are a bunch of existing warnings; This is also checked by travis)
• If applicable, add an entry in the changelog. ✅
• If applicable, add documentation to all new items and extend the guide. ✅
• If applicable, add tests for all new or fixed functions ✅

You might want to run tox (pip install tox) locally to check compatibility with all supported python versions. If you're using linux or mac you might find the Makefile helpful for testing.

[kngwyu]

Thanks, I think it's a really meaningful enhancement for us, but left comments about the coding.
In addition, I want a test in which we check that the module name is correctly set.

[althonos]

I forgot to push the latest commits with changelog expansion and tests for the module name, will do that when I can.

[codecov]

Codecov Report

Merging #499 into master will decrease coverage by 0.25%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #499      +/-   ##
==========================================
- Coverage    87.8%   87.54%   -0.26%     
==========================================
  Files          65       65              
  Lines        3435     3428       -7     
==========================================
- Hits         3016     3001      -15     
- Misses        419      427       +8

Impacted Files	Coverage Δ
src/types/slice.rs	95.65% <ø> (ø)	⬆️
src/types/num.rs	96% <ø> (ø)	⬆️
src/types/datetime.rs	100% <ø> (ø)	⬆️
src/types/module.rs	89.39% <ø> (ø)	⬆️
src/types/boolobject.rs	100% <ø> (ø)	⬆️
src/types/dict.rs	93.33% <ø> (ø)	⬆️
src/types/bytearray.rs	95.45% <ø> (ø)	⬆️
src/types/typeobject.rs	92% <ø> (ø)	⬆️
src/types/complex.rs	100% <ø> (ø)	⬆️
src/types/tuple.rs	90% <ø> (ø)	⬆️
... and 15 more

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[codecov]

Codecov Report

Merging #499 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff           @@
##           master    #499   +/-   ##
======================================
  Coverage    87.8%   87.8%           
======================================
  Files          65      65           
  Lines        3435    3435           
======================================
  Hits         3016    3016           
  Misses        419     419

Impacted Files	Coverage Δ
src/types/num.rs	96% <ø> (ø)	⬆️
src/types/datetime.rs	100% <ø> (ø)	⬆️
src/types/mod.rs	100% <ø> (ø)	⬆️
src/types/string.rs	89.83% <ø> (ø)	⬆️
src/types/set.rs	84.61% <ø> (ø)	⬆️
src/type_object.rs	89.09% <100%> (ø)	⬆️

---

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Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
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[kngwyu]

Thanks! 🎉