Add some opfamily support functions to lsyscache.c

Add get_opfamily_method() and get_opfamily_member_for_cmptype() in
lsyscache.c.  No callers yet, but we'll add some soon.  This is part
of generalizing some parts of the code away from having btree
hardcoded and use CompareType instead.

Author: Mark Dilger <[email protected]>
Discussion: https://www.postgresql.org/message-id/flat/[email protected]

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