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

- Extract QuoteUtils class and kwlist from pgsql-deparser into standalone @pgsql/quotes package
- Include keyword generator script for syncing with PostgreSQL kwlist.h
- Add comprehensive test suite (57 tests)
- Update deparser to depend on @pgsql/quotes and re-export for backwards compatibility

Author: pyramation

packages/deparser/package.json

@@ -58,6 +58,7 @@
     "makage": "^0.1.8"
   },
   "dependencies": {
+    "@pgsql/quotes": "workspace:*",
     "@pgsql/types": "^17.6.2"
   }
 }

packages/deparser/scripts/keywords.ts

@@ -41,7 +41,7 @@ async function main() {
     kwlistPathInput = requireNonEmpty(await ask("Path to PostgreSQL kwlist.h"), "kwlist.h path");
   }
 
-  const outPathInput = outArg ?? path.resolve(__dirname, "../src/kwlist.ts");
+  const outPathInput = outArg ?? path.resolve(__dirname, "../../quotes/src/kwlist.ts");
 
   const kwlistPath = path.resolve(expandTilde(kwlistPathInput));
   const outPath = path.resolve(outPathInput);