fix(cfs): exclude non-physical relations - #236
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cfs_compression_ratio() in PG Pro EE 16.13/18 leaks relcache for relations without physical CFS storage.
Early return without relation_close() produces WARNING on every call.
To mitigate that, relkind in CFS query is restricted to ('r','m','S'), and the query is wrapped in a subquery, so the planner calls cfs_compression_ratio only on filtered rows.