feat: create @pgsql/quotes package for PostgreSQL identifier quoting and keyword classification

[pyramation]

feat: extract @pgsql/quotes package from deparser

Summary

Extracts QuoteUtils and the PostgreSQL keyword list (kwlist) from pgsql-deparser into a new standalone @pgsql/quotes package. This makes PostgreSQL identifier quoting and keyword classification available without pulling in the entire deparser — useful for migration tools, ORMs, query builders, schema generators, etc.

New package (packages/quotes/):

• src/kwlist.ts — PG17 keyword list with keywordKindOf() and pre-built Set exports
• src/quote-utils.ts — QuoteUtils class (faithful port of PG's quote_identifier() from ruleutils.c)
• scripts/keywords.ts — canonical generator to re-sync from PostgreSQL's kwlist.h
• 57 tests covering all quoting methods and keyword classification
• Zero runtime dependencies

Deparser changes:

• Added @pgsql/quotes: workspace:* as a dependency
• src/deparser.ts and src/index.ts now import QuoteUtils directly from @pgsql/quotes
• Deleted src/kwlist.ts, src/utils/quote-utils.ts, and scripts/keywords.ts from the deparser — these now live exclusively in @pgsql/quotes
• Removed the keywords npm script from deparser's package.json

Review & Testing Checklist for Human

• Verify no downstream packages import deleted deparser files directly: src/kwlist.ts, src/utils/quote-utils.ts, and scripts/keywords.ts were removed from the deparser. The deparser's public API (index.ts) still re-exports QuoteUtils from @pgsql/quotes, but anything that imported those internal files by path will break. Grep the version-specific deparser packages and any other consumers.
• Confirm initial version 17.0.1 is correct for @pgsql/quotes and aligns with the monorepo's versioning strategy
• Confirm publishConfig.access: "public" is intended for the @pgsql/quotes scope
• Lockfile noise: The pnpm-lock.yaml diff is large but mostly pnpm quoting-style reformatting — spot-check that no unintended dependency changes snuck in

Suggested test plan:

1. pnpm --filter @pgsql/quotes test — 57 tests for the new package
2. pnpm --filter pgsql-deparser test — the deparser has 29 pre-existing failures on main (snapshot drift), unrelated to this PR; confirm no new failures
3. pnpm build — full workspace build to verify all packages compile cleanly

Notes

• Devin session: https://app.devin.ai/sessions/04cb692e52ed4f29ad493bd5297a213f
• Requested by: @pyramation

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