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Summary: * Make new format_version=7 a supported setting. * Fix a bug in compressed_secondary_cache.cc that is newly exercised by custom compression types and showing up in crash test with tiered secondary cache * Small change to handling of disabled compression in fv=7: use empty compression manager compatibility name. * Get rid of GetDefaultBuiltinCompressionManager() in public API because it could cause unexpected+unsafe schema change on a user's CompressionManager if built upon the default built-in manager and we add a new built-in schema. Now must be referenced by explicit compression schema version in the public API. (That notion was already exposed in compressed secondary cache API, for better or worse.) * Improve some error messages for compression misconfiguration * Improve testing with ObjectLibrary and CompressionManagers * Improve testing of compression_name table property in BlockBasedTableTest.BlockBasedTableProperties2 * Improve some comments Pull Request resolved: https://github.com/facebook/rocksdb/pull/13713 Test Plan: existing and updated tests. Notably, the crash test has already been running with (unpublished) format_version=7 Reviewed By: mszeszko-meta, hx235 Differential Revision: D77035482 Pulled By: pdillinger fbshipit-source-id: 95278de8734a79706a22361bff2184b1edb230ca