Support CREATE/DROP SECRET for duckdb dialect

[alamb]

This is a cleaned up version of #1196 from @JichaoS that has:

1. Merge up from main
2. Fixed fmt and clippy and doc tests

Closes #1196

[github-actions]

Pull Request Test Coverage Report for Build 8621756431

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 217 of 255 (85.1%) changed or added relevant lines in 3 files are covered.
• 2 unchanged lines in 1 file lost coverage.
• Overall coverage decreased (-0.03%) to 87.971%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/parser/mod.rs	85	103	82.52%
src/ast/mod.rs	60	80	75.0%

Files with Coverage Reduction	New Missed Lines	%
src/ast/mod.rs	2	80.09%

Totals
Change from base Build 8588850954:	-0.03%
Covered Lines:	21026
Relevant Lines:	23901

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💛 - Coveralls