Summary:
Add `rocksdb_disable_manual_compaction` and `rocksdb_enable_manual_compaction`.

Note that `rocksdb_enable_manual_compaction` should be used with care and must not be called more times than `rocksdb_disable_manual_compaction` has been called.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/10052

Reviewed By: ajkr

Differential Revision: D36665496

Pulled By: jay-zhuang

fbshipit-source-id: a4ae6e34694066feb21302ca1a5c365fb9de0ec7