[FEATURE] compute CM directly in trajectory

[loscati]

This closes #7
This PR allows computing the CM directly from trajectory. Moreover, it includes the sliced trajectory object from MDAnalysis to handle only part of the trajectory. This increases performance drastically.

The log framework has been moved from logging to loguru

[codecov]

Codecov Report

Attention: Patch coverage is 77.02703% with 17 lines in your changes are missing coverage. Please review.

Project coverage is 83.23%. Comparing base (97b4c20) to head (a3fd346).
Report is 1 commits behind head on main.

Files	Patch %	Lines
pyge/trajectory.py	75.75%	4 Missing and 4 partials ⚠️
pyge/singlechain.py	78.12%	4 Missing and 3 partials ⚠️
pyge/contacts/pdb_parser.py	50.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main       #8      +/-   ##
==========================================
- Coverage   83.38%   83.23%   -0.16%     
==========================================
  Files           9        9              
  Lines         313      334      +21     
  Branches       76       83       +7     
==========================================
+ Hits          261      278      +17     
- Misses         29       31       +2     
- Partials       23       25       +2     

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