add addepisode return object

[prasmussen15]

[!IMPORTANT] add_episode in graphiti.py now returns an AddEpisodeResults object, encapsulating episode, nodes, and edges, with a new class introduced to support this change.

• Behavior:
  • add_episode in graphiti.py now returns AddEpisodeResults object containing episode, nodes, and edges.
• Classes:
  • Introduces AddEpisodeResults class in graphiti.py to encapsulate return data for add_episode.
• Misc:
  • Adjusts indentation for method parameters in Graphiti class for better readability.
  • Minor formatting change in lucene_sanitize() in helpers.py.

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