Address code review feedback and enhance PostgreSQL compatibility

Major improvements:
- Make query timeout configurable via ServerOptions (default 300s)
- Fix error handling to use proper type checking instead of string matching
- Add comprehensive unit tests for enhance_query_with_type_casting function
- Remove connection timeout that limited max connection lifetime
- Add support for PostgreSQL oid, regtype, regclass, regproc type translation
- Register pg_catalog tables in public schema for asyncpg compatibility
- Add set_config() function for PostgreSQL client compatibility
- Add maintenance command support (UNLISTEN, RESET, DISCARD, DEALLOCATE)
- Fix schema resolution issues for unqualified table access
- Add .DS_Store to .gitignore for macOS compatibility

Code quality improvements:
- Fix clippy warnings (useless format, redundant closures)
- Add comprehensive test coverage
- Improve error handling patterns
- Make CLI async-compatible

These changes significantly improve PostgreSQL protocol compatibility
and address connection stability issues under load.

Author: iPeluwa

.gitignore

@@ -3,4 +3,8 @@
 .envrc
 .vscode
 .aider*
-/test_env
+/test_env
+
+# OS
+.DS_Store
+Thumbs.db

datafusion-postgres-cli/src/main.rs

@@ -179,7 +179,7 @@ async fn setup_session_context(
     }
 
     // Register pg_catalog
-    setup_pg_catalog(session_context, "datafusion")?;
+    setup_pg_catalog(session_context, "datafusion").await?;
 
     Ok(())
 }