feat: improve default value parsing

[ghusse]

Linked to #16787

Pull Request Checklist

• Have you added new tests to prevent regressions?
• If a documentation update is necessary, have you opened a PR to the documentation repository?
• Did you update the typescript typings accordingly (if applicable)?
• Does the description below contain a link to an existing issue (Closes #[issue]) or a description of the issue you are solving?
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Description of Changes

List of Breaking Changes

[WikiRik]

You might already be aware of this, but we have a helper function called expectPerDialect which you can use to add different assertions based on the dialect you are testing on. We prefer that that is used instead of adding dialect-specific test suites. It's fine while you are working on this, but I just wanted to bring it to your attention before the initial review

[ghusse]

Thanks, I think I'll use that in the general integration test of describeTable.

I don't think that could be usefull in the situation of testing default-value-parser with unit test, because tested cases heavily depend on the dialect too.