release-22.2: sql,cli: add SHOW FUNCTIONS command and \df metacommand #89760
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Backport 2/2 commits from #89557 on behalf of @rafiss.
/cc @cockroachdb/release
fixes #88597
Release note (sql change): Added the SHOW FUNCTIONS command, which lists
user-defined functions. The SHOW FUNCTIONS FROM syntax is
supported too.
Release note (cli change): The \df metacommand was added to the SQL
shell, which will list all user-defined functions in the current
database.
Release justification: low risk change to introspection