Add SQLite CRUD operations with optimizations

[anitnilay20]

Description

Implement INSERT, UPDATE, DELETE operations for SQLite with SQLite-specific optimizations.

Requirements

• INSERT OR REPLACE/IGNORE support
• Batch insert optimizations
• UPSERT operations
• SQLite constraint handling
• Row ID handling
• Write comprehensive tests

Acceptance Criteria

• Full CRUD support for SQLite
• SQLite-specific optimizations
• Proper handling of ROWID
• Batch operation support

Files to modify

• beatrix_core/src/relational/insert.rs
• beatrix_core/src/relational/update.rs
• beatrix_core/src/relational/delete.rs

Example Usage

// SQLite UPSERT
User::insert()
    .values(user)
    .on_conflict_replace()
    .execute(&db).await?;

// Batch insert with transaction
User::insert()
    .values_batch(users)
    .execute(&db).await?;