GEOPY-2576: class attribute are forced to be unique if strings: subclass ReferenceValueMap

[MatthieuCMira]

GEOPY-2576 - class attribute are forced to be unique if strings: subclass ReferenceValueMap
deal with str differently if the data_referenced is the main or not

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.05%. Comparing base (5a3b845) to head (09ccc65).

Additional details and impacted files

@@                Coverage Diff                 @@
##           release/GA_4.8     #886      +/-   ##
==================================================
- Coverage           91.09%   91.05%   -0.05%     
==================================================
  Files                 113      113              
  Lines               10459    10462       +3     
  Branches             1933     1934       +1     
==================================================
- Hits                 9528     9526       -2     
- Misses                493      497       +4     
- Partials              438      439       +1     

Files with missing lines	Coverage Δ
geoh5py/data/data_type.py	94.44% <100.00%> (ø)
geoh5py/data/reference_value_map.py	96.77% <100.00%> (+0.16%)	⬆️

... and 2 files with indirect coverage changes

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