Implement needs_fmgr_hook #3779
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Description
Implement needs_fmgr_hook to force fmgr_security_definer
for all routines. We need to force it since we change sql_dialect
before and after every function execution based on their lang.
Without this fix we are not chaning the sql_dialect for
inlinable functions and running into unexpected erros.
Issues Resolved
#3071
Check List
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