Add utility functions to manipulate atom positions and properties

[hadim]

Checklist:

• [x] Add tests to cover the fixed bug(s) or the new introduced feature(s) (if appropriate).
• [x] Update the API documentation is a new function is added or an existing one is deleted.
• [x] Added a news entry.
  • copy news/TEMPLATE.rst to news/my-feature-or-branch.rst) and edit it.

---

See the changelogs for details. The goal is to make it easier to manipulate atom properties and positions in order to be able to more easily reconstruct a molecule from an array of positions and a mapped SMILES with atom numbers.

[codecov[bot]]

Codecov Report

Merging #156 (90377c4) into main (20cdbd1) will increase coverage by 0.23%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #156      +/-   ##
==========================================
+ Coverage   90.57%   90.80%   +0.23%     
==========================================
  Files          46       46              
  Lines        3300     3362      +62     
==========================================
+ Hits         2989     3053      +64     
+ Misses        311      309       -2     

Flag	Coverage Δ
unittests	90.80% <100.00%> (+0.23%)	:arrow_up:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
datamol/mol.py	97.16% <100.00%> (+0.44%)	:arrow_up:
datamol/scaffold/_fuzzy.py	88.35% <0.00%> (+0.68%)	:arrow_up:
datamol/descriptors/descriptors.py	92.20% <0.00%> (+1.29%)	:arrow_up:

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