add delete nodes by group_id

[prasmussen15]

[!IMPORTANT] Add delete_by_group_id() to Node class, update routing in query functions, and modify tests in test_graphiti_int.py.

• Behavior:
  • Add delete_by_group_id() method in Node class in nodes.py to delete nodes by group_id.
  • Update delete() method in Node class to match nodes with labels Entity, Episodic, or Community.
• Routing:
  • Add routing_='r' to get_by_uuid(), get_by_uuids(), and get_by_group_ids() in edges.py and nodes.py.
• Tests:
  • Import Node class in test_graphiti_int.py.
  • Remove unused code in test_graphiti_int.py related to node and edge creation.
• Misc:
  • Update version in pyproject.toml from 0.4.1 to 0.4.2.

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