Summary:
So that we can use --command=recompress with a custom CompressionManager. (It's not required for reading files using a custom CompressionManager because those can already use ObjectLibrary for dependency injection.)
Suggested follow-up:
* These tests should not be using C arrays, snprintf, manual delete, etc. except for thin compatibility with argc/argv.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/13783
Test Plan: unit test added, some manual testing
Reviewed By: archang19
Differential Revision: D78574434
Pulled By: pdillinger
fbshipit-source-id: 609e6c6439090e6b7e9b63fbd4c2d3f04b104fcf
11a61ca109