Added DatabaseSources to forge

[crisely09]

Initial steps to have an external database as a kgforge Resource.

[codecov-commenter]

Codecov Report

Merging #273 (a4c7a47) into master (9a04477) will decrease coverage by 0.89%. The diff coverage is 61.33%.

@@            Coverage Diff             @@
##           master     #273      +/-   ##
==========================================
- Coverage   72.57%   71.67%   -0.90%     
==========================================
  Files          86       97      +11     
  Lines        5341     6009     +668     
==========================================
+ Hits         3876     4307     +431     
- Misses       1465     1702     +237     

Impacted Files	Coverage Δ
kgforge/core/conversions/rdf.py	87.95% <ø> (ø)
setup.py	0.00% <ø> (ø)
kgforge/core/archetypes/store.py	56.00% <12.90%> (-6.25%)	:arrow_down:
kgforge/specializations/models/rdf_model.py	76.82% <25.00%> (-5.73%)	:arrow_down:
kgforge/core/forge.py	58.13% <27.84%> (-11.92%)	:arrow_down:
...e/specializations/databases/webservice_database.py	43.56% <43.56%> (ø)
kgforge/specializations/stores/bluebrain_nexus.py	29.05% <50.00%> (+1.34%)	:arrow_up:
kgforge/specializations/stores/sparql.py	51.26% <51.26%> (ø)
kgforge/core/archetypes/database.py	65.55% <65.55%> (ø)
...gforge/specializations/databases/store_database.py	67.50% <67.50%> (ø)
... and 14 more

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