Add a new `text` episode type and update the `extract_nodes` function to handle it.
* **EpisodeType Enum:**
- Add `text` to the `EpisodeType` enum in `graphiti_core/nodes.py`.
- Update the `from_str` method to handle the `text` episode type.
* **extract_nodes Function:**
- Update the `extract_nodes` function in `graphiti_core/utils/maintenance/node_operations.py` to handle the `text` episode type.
- Use the `message` type prompt for both `message` and `text` episodes.
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