[OpenMP][OMPT] Update tools header for OpenMP v6.0 (#195829)
Add new enum values, structs and variables to `omp-tools.h` header,
according to the OpenMP v6.0 specification.
Update `openmp` and `offload` tools headers to recognize the new values
to ease testing once those features are implemented.
Since no feature is implemented here, update the docs to mention
`partial` support, pointing to this PR for the enums.
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Signed-off-by: Jan André Reuter <j.reuter@fz-juelich.de>