feat(parser): support ALTER .. [SET | RESET] CONFIG

[BugenZhao]

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What's changed and what's your intention?

Design RFC: Notion

Note that an extra keyword CONFIG is introduced and used because plain SET and RESET should be used to alter the entries from WITH (..), according to the convention of Postgres syntax. Although we've decided to use ALTER CONNECTOR WITH for this instead.

Checklist

• I have written necessary rustdoc comments.
• I have added necessary unit tests and integration tests.
• I have added test labels as necessary.
• I have added fuzzing tests or opened an issue to track them.
• My PR contains breaking changes.
• My PR changes performance-critical code, so I will run (micro) benchmarks and present the results.
• I have checked the Release Timeline and Currently Supported Versions to determine which release branches I need to cherry-pick this PR into.

Documentation

• My PR needs documentation updates.

Release note

[graphite-app]

Looks like this PR extends new SQL syntax or updates existing ones. Make sure that:

• Test cases about the new/updated syntax are added in src/sqlparser/tests/testdata. Especially, double check the formatted_sql is still a valid SQL #20713
• The meaning of each enum variant is documented in PR description. Additionally, document what it means when each optional clause is omitted.

[BugenZhao]

This change is part of the following stack:

• feat(parser): support ALTER .. [SET | RESET] CONFIG #23742 <-- you are here 🤪
  • feat(frontend): add handler for ALTER .. [SET | RESET] CONFIG #23748

_{Change managed by git-spice.}