Added configuration option to resolve within a given ontology

[crisely09]

The option to search within an ontology was added inside the configuration file, and the parameter to trigger this is resolving_context which should match one of the contexts names provided in the configuration.
Done:

• Unit tests
• Examples in resolving notebooks.

[crisely09]

@MFSY this is ready to be reviewed

[codecov-commenter]

Codecov Report

Merging #290 (7fd2d51) into master (3a9d774) will increase coverage by 0.17%.
The diff coverage is 65.17%.

@@            Coverage Diff             @@
##           master     #290      +/-   ##
==========================================
+ Coverage   72.68%   72.85%   +0.17%     
==========================================
  Files          86       88       +2     
  Lines        5499     5574      +75     
==========================================
+ Hits         3997     4061      +64     
- Misses       1502     1513      +11     

Impacted Files	Coverage Δ
kgentitylinkingsklearn/entity_linking_sklearn.py	0.00% <0.00%> (ø)
..._linking/service/entity_linking_elastic_service.py	37.73% <0.00%> (-0.73%)	⬇️
kgforge/specializations/resolvers/store_service.py	21.42% <13.63%> (-9.61%)	⬇️
...gforge/specializations/resolvers/agent_resolver.py	58.97% <35.71%> (+16.11%)	⬆️
...rge/specializations/resolvers/ontology_resolver.py	59.45% <42.85%> (+14.36%)	⬆️
kgforge/specializations/stores/bluebrain_nexus.py	22.34% <50.00%> (-5.03%)	⬇️
kgforge/specializations/resolvers/demo_resolver.py	47.76% <57.14%> (-1.45%)	⬇️
.../resolvers/entity_linking/entity_linker_elastic.py	62.06% <62.50%> (-5.94%)	⬇️
kgforge/core/archetypes/resolver.py	64.39% <74.46%> (+2.85%)	⬆️
kgforge/core/commons/sparql_query_builder.py	92.98% <92.98%> (ø)
... and 7 more

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[MFSY]

@MFSY this is ready to be reviewed

I proposed to use the existing resolving 'target' as a way to specify the ontology to resolve to.

[crisely09]

@MFSY Done, now it uses a dictionary. I also changed filter to filters because we are assuming that we can have more than one.