Quote operator names when restoring them after CREATE/DROP OPERATOR

[youdie006]

_restore_operator() puts the operator name into the substitution pattern without escaping it, so names containing ?, | or * are read as a regex. CREATE OPERATOR ?| (...) turns into an empty alternation and inserts ?| between every character of the output, ? becomes ???, and <| becomes <||<|; DROP OPERATOR is affected the same way (hstore's install script no longer parses after formatting).

This uses \Q...\E, as _quote_operator() already does. Added t/test-files/ex89.sql and updated four regression goldens (create_operator, drop_operator, privileges, tsrf) that had recorded the mangled names. All 74 operator names from pg_operator.dat now survive CREATE/DROP OPERATOR unchanged. prove -l t/ and t/regress_test.pl pass.

If #418 lands first, the test count in t/02_regress.t needs one more bump; I can rebase.

Written with AI assistance (Claude); I have reviewed the change.