Implement SQLite database adapter

[anitnilay20]

Description

Create SQLite database adapter for development and lightweight applications.

Requirements

• Implement Database trait for SQLite
• SQLite connection handling with rusqlite or sqlx
• File-based database support
• In-memory database option
• SQLite-specific SQL syntax handling
• Write comprehensive tests

Acceptance Criteria

• SQLite adapter implements Database trait
• Support for file and in-memory databases
• SQLite-specific SQL generation
• Feature flag for SQLite support

Files to create

• beatrix_core/src/relational/db/sqlite.rs
• Update beatrix_core/Cargo.toml with SQLite dependencies

Example Usage

use beatrix::relational::SQLite;

// File database
let db = SQLite::new("database.db").await?;

// In-memory database
let db = SQLite::memory().await?;

let users = User::select().fetch_all(&db).await?;