Add FileMetadata table and RowMetadataRegistry
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This PR is mostly a port of internal code from Polygon.io, with some new additions to make it generic so that users with custom
TableProviderimplementations can use it effectively.FileMetadatais a customTableProviderthat exposes object store metadata through SQL. It implementsRowMetadataSource, a trait that provides metadata which will be used in incremental view maintenance (which is not included in this PR).In order for these components to accommodate custom table types, we have added a
ListingTableLiketrait that abstracts away the essential features of a Hive-partitioned table. Users must register their custom table types using theregister_listing_tableAPI if they expect this crate to detect and work properly with these tables.This PR ended up quite a bit bigger than I expected, unfortunately. Most of the length comes from the
FileMetadatatable provider, which implements filter pushdown.