[common] Accelerate endsWith and like '%x' with reverse btree global index

[ArnavBalyan]

Purpose:

• Introduce a reverse btree global index:
  • This can be used to serve variety of queries using endsWith and LIKE '%abc' patterns.
  • Stores keys which are reversed (using ReversedKeySerializer), allowing a suffix query to be converted into a prefix scan of the reversed values.
• ReverseLazyFilteredBTreeReader routes endsWith and like queries through the existing prefix scan, and uses min/max pruning instead of full scan.
• Reuses the existing btree file format (only key bytes are reversed). In the future more complex like clauses can be offloaded in combination with the straight btree index.

Tests

• Unit Tests

[ArnavBalyan]

cc @JingsongLi @leaves12138 thanks! :)