Fix rebase: adapt ordinal intoBitSet fast path to current Bulk* hierarchy; make test mocks support advanceExact for ordinalRangeIntoBitSet

- Add BulkSortedRangeIterator (modeled on BulkNumeric) used only for SortedDocValues single-valued ranges so MAYBE blocks can use the (SIMD) ordinalRangeIntoBitSet.
- forOrdinalRange(SortedDocValues) now creates it (SortedSet ranges stay on BulkOrdinalRangeIterator + predicate).
- Update mocks in ordinal range/set iterator tests to implement advanceExact (the default impl of ordinalRangeIntoBitSet calls it; real codecs override for speed).
- This makes contiguous ordinal set conversion (in main) + intoBitSet tests + sparse after-matches work.

The previous rebase had left an older snapshot of DocValuesRangeIterator on the feature commits.

Author: iprithv