Commented out __hash__() and __eq__() methods from Literal.

[jesper-friis]

This fixes the issues in SINTEF/dlite#375

We still have to understand exactly why adding __hash__() and __eq__() creates an issue. It seems to change the datatype of some literals...

[codecov-commenter]

Codecov Report

Base: 74.05% // Head: 73.43% // Decreases project coverage by -0.62% ⚠️

Coverage data is based on head (4a29dc1) compared to base (653cfb7).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #55      +/-   ##
==========================================
- Coverage   74.05%   73.43%   -0.63%     
==========================================
  Files          12       12              
  Lines         740      734       -6     
==========================================
- Hits          548      539       -9     
- Misses        192      195       +3     

Impacted Files	Coverage Δ
tripper/literal.py	83.33% <ø> (-1.52%)	⬇️
tripper/namespace.py	89.15% <0.00%> (-3.62%)	⬇️

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