Merge to master: Release 2.4.0 - Multi-backend stores integrations, RDF 3.0 and SOLR API

[syphax-bouazzouni]

Changes

• https://github.com/ontoportal-lirmm/goo/pull/48
• https://github.com/ontoportal-lirmm/goo/pull/52
• https://github.com/ontoportal-lirmm/goo/pull/53
• https://github.com/ontoportal-lirmm/goo/pull/56
• Fix: saving a model removing unmodified attributes after consecutive save (https://github.com/ontoportal-lirmm/goo/pull/58/commits/66b68ab53e731501bd453be1ffd7a76f7c795626)
• https://github.com/ontoportal-lirmm/goo/pull/57
• Fix: monkey path RDF to not remove xsd:string by default (https://github.com/ontoportal-lirmm/goo/pull/58/commits/4951e7289760db2a601e091e5c5b054af1b2a470)
• https://github.com/ontoportal-lirmm/goo/pull/54
• https://github.com/ontoportal-lirmm/goo/pull/59
• https://github.com/ontoportal-lirmm/goo/pull/60
• fix search resource_id case insensitive by using string_ci instead

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 85.96908% with 118 lines in your changes are missing coverage. Please review.

Project coverage is 86.35%. Comparing base (8ddd2d7) to head (0e554fc).

:exclamation: Current head 0e554fc differs from pull request most recent head b2a635f. Consider uploading reports for the commit b2a635f to get more accurate results

Files	Patch %	Lines
lib/goo/search/solr/solr_schema.rb	72.34%	26 Missing :warning:
lib/goo/sparql/processor.rb	74.39%	21 Missing :warning:
lib/goo/search/search.rb	82.79%	16 Missing :warning:
lib/goo/search/solr/solr_admin.rb	69.76%	13 Missing :warning:
lib/goo/base/settings/attribute.rb	92.25%	11 Missing :warning:
lib/goo/search/solr/solr_query.rb	86.79%	7 Missing :warning:
lib/goo/search/solr/solr_schema_generator.rb	85.36%	6 Missing :warning:
lib/goo.rb	87.50%	5 Missing :warning:
lib/goo/base/resource.rb	88.23%	2 Missing :warning:
lib/goo/base/settings/settings.rb	92.00%	2 Missing :warning:
... and 5 more

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #58 +/- ## ========================================== + Coverage 85.93% 86.35% +0.41% ========================================== Files 37 46 +9 Lines 2674 3027 +353 ========================================== + Hits 2298 2614 +316 - Misses 376 413 +37 ```

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