Add generic taxonomy change processor

[apeteri]

The PR also removes LongBidiMapWithInternalId, which previously provided an SCTID 🡘 long storage key mapping in addition to an integer index. Since it was only used for an SCTID 🡘 integer index mapping, it is replaced with a LongOrderedSet implementation.

[codecov-commenter]

Codecov Report

Merging #981 (f21f7e3) into 8.x (fd56483) will increase coverage by 0.16%.
The diff coverage is 50.87%.

@@             Coverage Diff              @@
##                8.x     #981      +/-   ##
============================================
+ Coverage     64.60%   64.76%   +0.16%     
- Complexity    11878    12099     +221     
============================================
  Files          1689     1697       +8     
  Lines         55551    56273     +722     
  Branches       5152     5236      +84     
============================================
+ Hits          35887    36445     +558     
- Misses        17469    17599     +130     
- Partials       2195     2229      +34     

Impacted Files	Coverage Δ
...com/b2international/collections/PrimitiveMaps.java	38.09% <0.00%> (+2.19%)	⬆️
...ional/collections/FastUtilPrimitiveMapFactory.java	40.74% <0.00%> (+6.12%)	⬆️
...l/core/taxonomy/SimpleTaxonomyChangeProcessor.java	0.00% <0.00%> (ø)
...nternational/snowowl/core/taxonomy/SimpleEdge.java	31.57% <31.57%> (ø)
...ational/commons/collections/SparseFixedBitSet.java	32.74% <32.74%> (ø)
.../src/com/b2international/commons/CompareUtils.java	53.12% <50.00%> (+3.12%)	⬆️
...nal/snowowl/core/taxonomy/SimpleTaxonomyGraph.java	76.92% <76.92%> (ø)
...ernational/commons/collect/LongOrderedSetImpl.java	85.93% <85.93%> (ø)
...ernational/commons/collections/OrderedSetImpl.java	86.36% <86.36%> (ø)
...owowl/snomed/datastore/taxonomy/TaxonomyGraph.java	73.78% <87.50%> (+0.16%)	⬆️
... and 52 more

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[cmark]

Looks really impressive @apeteri! I'm going to digest the SimpleTaxonomyGraph and ChangeProcessor classes tomorrow.

[cmark]

LGTM!