Add support for ENABLE and DISABLE on ALTER TABLE for pg

[tobyhede]

Add support for the following pg syntax

# enable
ALTER TABLE tab ENABLE ALWAYS RULE rule_name
ALTER TABLE tab ENABLE ALWAYS TRIGGER trigger_name
ALTER TABLE tab ENABLE REPLICA TRIGGER trigger_name
ALTER TABLE tab ENABLE REPLICA RULE rule_name
ALTER TABLE tab ENABLE ROW LEVEL SECURITY
ALTER TABLE tab ENABLE RULE rule_name
ALTER TABLE tab ENABLE TRIGGER ALL
ALTER TABLE tab ENABLE TRIGGER USER
ALTER TABLE tab ENABLE TRIGGER trigger_name

# disable
ALTER TABLE tab DISABLE ROW LEVEL SECURITY
ALTER TABLE tab DISABLE RULE rule_name
ALTER TABLE tab DISABLE TRIGGER ALL
ALTER TABLE tab DISABLE TRIGGER USER
ALTER TABLE tab DISABLE TRIGGER trigger_name

[coveralls]

Pull Request Test Coverage Report for Build 7362770487

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.1%) to 87.839%

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Totals
Change from base Build 7314541195:	0.1%
Covered Lines:	18447
Relevant Lines:	21001

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💛 - Coveralls

[tobyhede]

New clippy rule dropped.

[tobyhede]

New clippy rule dropped.

[alamb]

Looks good to me -- thank you for the contribution @tobyhede

[alamb]

maybe we can fix this in a follow on PR (as in remove the clippy allow and then fix the tests to conform to the new clippy opinions)

[tobyhede]

Yeah, is a good idea. I tried to fix, but without the raw the parser errors with Unterminated string literal.
I wasn't sure enough of the underlying intent to make more a dramatic change.