[OpenMP] Add OpenMP extension API to dump mapping tables (#85381)

This adds an API call ompx_dump_mapping_tables.
This allows users to debug the mapping tables and can be especially
useful for unified shared memory applications to check if the code
behaves in the way it should. The implementation reuses code already
present to dump mapping tables (in a debug setting).

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Co-authored-by: Joseph Huber <huberjn@outlook.com>