Add support for quoted identifiers

[dbrattli]

Proposed Changes

Add support for quoted identifiers (https://www.postgresql.org/docs/13/sql-syntax-lexical.html). Also make sure identifiers are not reserved keywords. Currently the parser would except invalid SQL e.g:

SELECT * FROM FROM

With this PR you would need to use a quoted identifier, and quoted identifiers are also parsed correctly (previously they would be ignored):

SELECT * FROM "FROM"

Types of changes

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• [ ] Bugfix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist

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• [x] Build and tests pass locally
• [x] I have added tests that prove my fix is effective or that my feature works (if appropriate)
• [ ] I have added necessary documentation (if appropriate)

Further comments

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[dbrattli]

Some whitespace removed 😬 . If it's a problem I can revert it.