OPENDJ-1591 (CR-5206) Switch to SDK matching rules

After r11260 some code cleanup can be performed.

ApproximateIndexer.java, EqualityIndexer.java, OrderingIndexer.java, SubstringIndexer.java: REMOVED
Replaced with calling MatchingRule.getIndexers().

AttributeIndex.java:
Consequence of removing the indexer types.
Changed buildExtIndex() into buildIndexes() + getMatchingRule().
Factorized code by extracting IndexFilterType enum: Inlined several evaluate*Filter() methods and replaced them with the newly extracted methods evaluateFilter() + getIndexQuery().
Simplified evaluateBoundedRange() with the help of the newly extracted methods evaluateFilter() + getIndexQuery().
Extracted method isIndexAcceptable().
Changed buildExtIndex() into buildIndexes().
Extracted methods applyChangeToPresenceIndex() and applyChangeToExtensibleIndexes() from applyConfigurationChange().
In applyChangeToIndex(), reworked the code.
Removed openNewIndex().

IndexFilter.java:
Consequence of the changes to AttributeIndex.evaluate*Filter().
Removed several evaluate*Filter() methods and replaced them with a single extracted evaluateFilter() method.

TestBackendImpl.java:
Consequence of removing the indexer types.