feat: integrate SQLGlot for SQL to Pure Relation conversion

[neema2]

SQLGlot Integration for LegendQL

Integrates SQLGlot to parse SQL and map to LegendQL metamodel for Pure Relation code generation.

Overview

This PR adds SQLGlot integration to LegendQL, enabling conversion of SQL statements like SELECT colA, colB FROM tableC into Pure "Relation" code.

Key Features

• SQLToLegendQLConverter class that parses SQL using SQLGlot and maps it to LegendQL metamodel
• sql_to_pure_relation function for direct SQL to Pure Relation conversion
• Support for basic SELECT statements with column selection
• Integration with existing LegendQL database definitions and schema

Files Added/Modified

• legendql/sql_parser.py - Main SQLGlot integration module
• pyproject.toml - Added SQLGlot dependency (>=26.0.0)
• test_sql_integration.py - Test script demonstrating the integration
• legendql/__init__.py - Exposed new SQL functions in public API
• legendql/sql_examples.py - Examples showing SQL to Pure Relation conversion

Example Usage

from legendql import sql_to_pure_relation

sql = "SELECT colA, colB FROM tableC"
pure_relation_code = sql_to_pure_relation(sql, db_def, database)

Link to Devin run: https://app.devin.ai/sessions/f39fbe1f08434260a8b2ec70646a14a1

Requested by: Neema Raphael (neema.raphael@gs.com)

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