[SPARK-23850][sql][branch-2.2] Add separate config for SQL options redaction. #21365
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The old code was relying on a core configuration and extended its
default value to include things that redact desired things in the
app's environment. Instead, add a SQL-specific option for which
options to redact, and apply both the core and SQL-specific rules
when redacting the options in the save command.
This is a little sub-optimal since it adds another config, but it
retains the current default behavior.
While there I also fixed a typo and a couple of minor config API
usage issues in the related redaction option that SQL already had.
Tested with existing unit tests, plus checking the env page on
a shell UI.
(cherry picked from commit ed7ba7d)