Upgraded to rdflib>=6.0.0 and pyshacl==v0.17.2:

[MFSY]

This commit is for catching up with the latest releases of pyshacl and rdflib.

• Removed rdflib-jsonld dependancy which is now part of rdflib from rdflib>=6.0.0
• Added a ShapeWrapper class extending pyshacl.shape to workaround added slots preventing from dynamically adding methods
• Set min python version to v3.7 as required by pyshacl from 0.17.0

[codecov-commenter]

Codecov Report

Merging #201 (5b43d17) into master (e53c3f9) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #201      +/-   ##
==========================================
+ Coverage   72.24%   72.25%   +0.01%     
==========================================
  Files          79       79              
  Lines        4878     4887       +9     
==========================================
+ Hits         3524     3531       +7     
- Misses       1354     1356       +2     

Impacted Files	Coverage Δ
setup.py	0.00% <ø> (ø)
kgforge/core/commons/context.py	92.30% <100.00%> (-0.29%)	⬇️
kgforge/core/conversions/rdf.py	84.45% <100.00%> (ø)
kgforge/specializations/models/rdf/service.py	88.31% <100.00%> (+0.11%)	⬆️
...ge/specializations/models/rdf/directory_service.py	92.15% <0.00%> (-1.97%)	⬇️

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