SNRAY-124: Search concepts by membership

[apeteri]

This PR adds a new concept search property named isActiveMemberOf; matching concepts should have at least one active member referring to them in any of the listed reference sets.

[codecov-commenter]

Codecov Report

Merging #879 (780e183) into 8.x (5900031) will increase coverage by 0.11%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##                8.x     #879      +/-   ##
============================================
+ Coverage     62.46%   62.58%   +0.11%     
- Complexity    11465    11506      +41     
============================================
  Files          1709     1711       +2     
  Lines         55001    55054      +53     
  Branches       5267     5270       +3     
============================================
+ Hits          34359    34456      +97     
+ Misses        18467    18425      -42     
+ Partials       2175     2173       -2     

Impacted Files	Coverage Δ
...owl/snomed/core/rest/SnomedConceptRestService.java	97.46% <100.00%> (+0.03%)	⬆️
...omed/core/rest/domain/SnomedConceptRestSearch.java	52.63% <100.00%> (+4.06%)	⬆️
...e/index/change/ReferringMemberChangeProcessor.java	100.00% <100.00%> (ø)
...nternational/snowowl/core/events/util/Promise.java	69.64% <0.00%> (-1.79%)	⬇️
...datastore/index/change/ConceptChangeProcessor.java	95.89% <0.00%> (-0.92%)	⬇️
...om/b2international/index/revision/StagingArea.java	93.79% <0.00%> (-0.34%)	⬇️
...owowl/core/rest/suggest/SuggestRestParameters.java	100.00% <0.00%> (ø)
.../snowowl/core/rest/suggest/SuggestRestService.java	100.00% <0.00%> (ø)
...national/index/revision/BaseRevisionBranching.java	86.36% <0.00%> (+1.29%)	⬆️
...2international/commons/options/HashMapOptions.java	50.00% <0.00%> (+1.35%)	⬆️
... and 11 more

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[cmark]

LGTM!