Update extensions with GIN/GIST support for parallel query.

Commit 749a787c5b25ae33b3d4da0ef12aa05214aa73c7 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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