refactor: centralize quote-utils to use generated kwlist.ts

[pyramation]

Summary

Removes the hardcoded RESERVED_WORDS Set from quote-utils.ts and replaces it with imports from the generated kwlist.ts. This eliminates duplication and ensures quote-utils stays in sync with PostgreSQL's keyword definitions.

Changes:

• quote-utils.ts: Removed 15-line hardcoded RESERVED_WORDS Set, now imports RESERVED_KEYWORDS and TYPE_FUNC_NAME_KEYWORDS from kwlist.ts
• kwlist.ts: Added explicit Set<string> type annotations to exported Sets (required for TypeScript compatibility when calling .has() with a string argument)
• scripts/keywords.ts: Updated the generator script to include Set<string> type annotations, ensuring they persist when kwlist.ts is regenerated
• deparser.ts: Removed Deparser.RESERVED_WORDS and Deparser.needsQuotes(), replaced with QuoteUtils.quoteString() - all quoting logic is now centralized in QuoteUtils

Review & Testing Checklist for Human

• Verify keyword coverage: The old RESERVED_WORDS combined both reserved keywords and type/func name keywords. Confirm that RESERVED_KEYWORDS.has(x) || TYPE_FUNC_NAME_KEYWORDS.has(x) covers the same set of words
• Test identifier quoting: Try deparsing SQL with identifiers that are reserved words (e.g., SELECT "user", "table" FROM foo) to verify quoting behavior is unchanged
• Check edge cases: Test identifiers that were in the old list but might be categorized differently in kwlist.ts

Recommended test plan: Run the deparser on a variety of SQL statements with reserved word identifiers and compare output before/after this change.

Notes

284 of 285 deparser tests pass. There is one pre-existing test failure (latest-postgres-create_view.test.ts) related to system_user function formatting (COERCE_SQL_SYNTAX vs COERCE_EXPLICIT_CALL) that is unrelated to this change. The pre-existing eslint config issues and proto-parser test failures are also unrelated.

Link to Devin run: https://app.devin.ai/sessions/de94b880ef5243deb4a8e76adb6875d6
Requested by: Dan Lynch (@pyramation)

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