Add get_column_family_metadata() related structs and APIs #657
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What's in this PR
This PR adds get_column_family_metadata_cf() API based on rocksdb-10207
that returns the metadata of the specified column family that describes its level
structure.
get_column_family_metadata_cf() returns a ColumnFamilyMetaData, which
includes basic properties of the column family and a vector of LevelMetaData
that includes a vector of FileMetaData.
Test Plan
Add a new test that constructs a rocksdb instance with multiple levels and
verify the level structure using get_column_family_metadata_cf().
Temporarily put this PR as a draft as this PR requires a newer release of rocksdb.