Implement SQLite migration system

[anitnilay20]

Description

Add migration system for SQLite with SQLite-specific DDL limitations and workarounds.

Requirements

• SQLite DDL operations (CREATE, DROP)
• ALTER TABLE limitations handling
• Table recreation for complex changes
• Index management
• Foreign key support
• Write comprehensive tests

Acceptance Criteria

• SQLite migration support with limitations handled
• Table recreation for unsupported ALTER operations
• Proper foreign key handling
• Index management

Files to create

• beatrix_core/src/relational/migrations/sqlite.rs

Example Usage

Migration::new("add_user_column")
    .alter_table("users", |table| {
        table.add_column("phone", "TEXT");
    })
    .run(&db).await?; // Handles table recreation if needed