[WIP] Enhance SQL editor to support select database and SQL Server, SQLite

[Copilot]

Plan: Improve SQL Editor Options

Backend Changes (Rust)

• Add SQLite and SQLServer variants to DatabaseType enum in models.rs
• Update ConnectionConfig::connection_string() to support SQL Server and SQLite
• Create new modules: src-tauri/src/database/sqlite.rs and src-tauri/src/database/sqlserver.rs
• Implement core functions for SQLite: connect, test, get_tables, get_table_structure, execute_query
• Implement core functions for SQL Server: connect, test, get_tables, get_table_structure, execute_query
• Add SQLx features for sqlite and mssql to Cargo.toml
• Update database/mod.rs to handle SQLite and SQL Server connections
• Implement list_databases for SQLite and SQL Server
• Add switch_database command to support SELECT DATABASE functionality

Frontend Changes (TypeScript/React)

• Update DatabaseType type in frontend TypeScript files
• Add SQLite and SQL Server options to ConnectionForm.tsx
• Update DatabaseIcon component to support SQLite and SQL Server
• Add database switcher UI component in the query editor area
• Implement frontend logic to call switch_database command
• Update Monaco Editor to enhance SQL autocomplete for all database types

Testing

• Test SQLite connection and queries
• Test SQL Server connection and queries
• Test database switching functionality
• Ensure existing PostgreSQL and MySQL functionality works correctly

Original prompt

mejora las opciones denla parte del editor sql para que admita select database, y agrega soporte para sql server y sqlite

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