Add SQLite JSON support and functions

[anitnilay20]

Description

Implement SQLite JSON1 extension support with JSON functions and operations.

Requirements

• JSON1 extension integration
• JSON path expressions
• JSON modification functions
• JSON aggregation functions
• Type-safe JSON operations
• Write comprehensive tests

Acceptance Criteria

• Complete JSON1 extension support
• JSON path query capabilities
• JSON modification operations
• Type-safe JSON handling

Files to create

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

Example Usage

#[derive(RelationalModel)]
struct User {
    id: i32,
    metadata: Json<UserMetadata>,
}

let users = User::select()
    .where_clause(json_extract(User::metadata(), "$.role").eq("admin"))
    .fetch_all(&db).await?;