Fixed sparql query builder

[MFSY]

• SPARQL query builder: keep JSON primitive types and avoid parsing str literal but only for dateTime which are now required to have '^^xsd:dateTime' or '^^http://www.w3.org/2001/XMLSchema#dateTime' as a suffix
• Fixed single file download
• Search/retrieve: Replaced 'source' argument with 'retrieve_source' arg
• Raised exception if the 'filters' argument is used in forge.search(…)
• Added support for IN SPARQL clause fixes #242

[codecov-commenter]

Codecov Report

Merging #240 (47cabae) into master (c0003f4) will increase coverage by 0.08%. The diff coverage is 48.43%.

@@            Coverage Diff             @@
##           master     #240      +/-   ##
==========================================
+ Coverage   72.22%   72.30%   +0.08%     
==========================================
  Files          85       85              
  Lines        5260     5276      +16     
==========================================
+ Hits         3799     3815      +16     
  Misses       1461     1461              

Impacted Files	Coverage Δ
kgforge/specializations/stores/nexus/service.py	56.48% <0.00%> (ø)
...sts/specializations/stores/test_bluebrain_nexus.py	91.93% <ø> (ø)
kgforge/specializations/stores/bluebrain_nexus.py	27.76% <12.50%> (-0.14%)	:arrow_down:
kgforge/core/commons/parser.py	60.00% <60.00%> (-25.72%)	:arrow_down:
kgforge/core/archetypes/store.py	62.24% <76.92%> (+5.67%)	:arrow_up:
tests/core/archetypes/test_store.py	100.00% <100.00%> (ø)

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