Add SQL Support

[juarezr]

Add SQL Support to Pastum Extension

✨ New Features

• 7 SQL Statement Types: SELECT, INSERT, DELETE, CREATE TABLE with multiple variants
• Smart Data Type Detection: Automatic mapping to appropriate SQL types (VARCHAR, NUMERIC, BOOLEAN, INTEGER)
• VS Code Integration: New command and configuration options
• Default Paste Support: Works seamlessly with SQL files

🔧 SQL Statement Types

• SELECT FROM VALUES - Query with VALUES clause
• SELECT UNION ALL - CTE-based approach
• INSERT INTO VALUES - Standard INSERT statements
• INSERT INTO SELECT VALUES - INSERT with subquery
• INSERT INTO - Multiple individual INSERTs
• DELETE WHERE - DELETE with WHERE conditions
• CREATE TABLE - DDL table creation

⚙️ Configuration

• New pastum.defaultSqlStatement setting
• Defaults to "INSERT INTO VALUES"
• Integrated with existing configuration system

✅ ✅ Testing

• ✅ All 41 tests passing
• ✅ Comprehensive test coverage for SQL module
• ✅ Extension activation tests updated
• ✅ No syntax or linting errors

✅ ✅ Technical Details

• Added src/paste-sql.js (220 lines)
• Updated extension registration
• Enhanced default paste functionality
• Version bumped to 0.3.0

[juarezr]

Tested with MySQL, Postgres, and MSSQL.

[juarezr]

Closes #17

[atsyplenkov]

@cursor review

[cursor]

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[atsyplenkov]

Can you please update the CHANGELOG.md?