SPARQLStore specialization

[crisely09]

Adding a SPARQL specialization of a DatasetStore, built on top of #353

• Missing more unit tests
• Missing other tests for particular database examples
• Changes here should be merged with Sarah's code to unify the SPARQL modules and methods.

[codecov-commenter]

Codecov Report

Attention: 176 lines in your changes are missing coverage. Please review.

Comparison is base (4952365) 74.48% compared to head (bd16254) 74.42%.

Files	Patch %	Lines
kgforge/core/archetypes/read_only_store.py	49.47%	48 Missing ⚠️
kgforge/core/archetypes/dataset_store.py	51.31%	37 Missing ⚠️
kgforge/specializations/stores/bluebrain_nexus.py	40.42%	28 Missing ⚠️
kgforge/specializations/stores/sparql_store.py	64.55%	28 Missing ⚠️
kgforge/core/commons/sparql_query_builder.py	92.47%	7 Missing ⚠️
kgforge/core/archetypes/store.py	79.16%	5 Missing ⚠️
kgforge/core/commons/es_query_builder.py	37.50%	5 Missing ⚠️
kgforge/core/forge.py	58.33%	5 Missing ⚠️
kgforge/core/commons/execution.py	42.85%	4 Missing ⚠️
kgforge/core/commons/query_builder.py	60.00%	4 Missing ⚠️
... and 2 more

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #360      +/-   ##
==========================================
- Coverage   74.48%   74.42%   -0.06%     
==========================================
  Files          93      100       +7     
  Lines        5894     6213     +319     
==========================================
+ Hits         4390     4624     +234     
- Misses       1504     1589      +85     

Flag	Coverage Δ
unittests	74.42% <69.65%> (-0.06%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.