refactor: improve accessor implementation

[12rambau]

Fix #191
Fix #189

[codecov]

Codecov Report

Attention: 25 lines in your changes are missing coverage. Please review.

Comparison is base (5da5b6d) 36.41% compared to head (d7da3da) 36.52%.

Files	Patch %	Lines
geetools/Initialize/__init__.py	46.15%	14 Missing ⚠️
geetools/Authenticate/__init__.py	66.66%	5 Missing ⚠️
geetools/accessors.py	76.47%	2 Missing and 2 partials ⚠️
geetools/ComputedObject/__init__.py	87.50%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #193      +/-   ##
==========================================
+ Coverage   36.41%   36.52%   +0.10%     
==========================================
  Files          53       52       -1     
  Lines        2908     2927      +19     
  Branches      291      296       +5     
==========================================
+ Hits         1059     1069      +10     
- Misses       1846     1853       +7     
- Partials        3        5       +2     

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