Feature/synthetic graph generator

[skn8733]

This PR introduces a new script to generate a synthetic CRE and Standards graph for benchmarking. It creates 200 synthetic CRE nodes linked to 10 standard nodes and saves them into the SQLite cache. Additionally, Makefile commands were added to automate synthetic data generation.

Added generate_synthetic_graph.py script for creating synthetic CREs and Standards.

Updated Makefile to include commands for generating synthetic data.

Minor changes to Neo4j connection settings for improved stability.

This will help with testing and profiling gap analysis queries on synthetic datasets as part of the GSoC project milestones.