Update extensions with GIN/GIST support for parallel query.
Commit 749a787c bumped the extension version on all of these extensions already, and we haven't had a release since then, so we can make further changes without bumping the extension version again. Take this opportunity to mark all of the functions exported by these modules PARALLEL SAFE -- except for pg_trgm's set_limit(). Mark that one PARALLEL RESTRICTED, because it makes a persistent change to a GUC value. Note that some of the markings added by this commit don't have any effect; for example, gseg_picksplit() isn't likely to be mentioned explicitly in a query and therefore it's parallel-safety marking will never be consulted. But this commit just marks everything for consistency: if it were somehow used in a query, that would be fine as far as parallel query is concerned, since it does not consult any backend-private state, attempt to write data, etc. Andreas Karlsson, with a few revisions by me.
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