Add pending status in WebsetStatus and WebsetSearchStatus enum

[Shivam010]

Summary

Adds the missing pending status to the WebsetStatus and WebsetSearchStatus enum. We are receiving the pending status in the webset create API, but the SDK was missing this value, causing the ValidationError when validating the response.

Error:

2 validation errors for Webset
status
  Input should be 'idle', 'running' or 'paused' [type=enum, input_value='pending', input_type=str]
    For further information visit https://errors.pydantic.dev/2.12/v/enum
searches.0.status
  Input should be 'created', 'running', 'completed' or 'canceled' [type=enum, input_value='pending', input_type=str]
    For further information visit https://errors.pydantic.dev/2.12/v/enum

Trace: puts it right at the model_validate call with response.status containing pending

        Returns:
            Webset: The created webset.
        """
        response = await self.request("/v0/websets", data=params, options=options)
        return Webset.model_validate(response) <<<<<

---

API reference does say pending status is possible