Support serialization and deserialization of Pydantic `BaseModel` when creating a `PipelineSnaphsot`

[anakin87]

Sometimes it is useful to support Pydantic BaseModels as pipeline/component inputs/outputs.

We don't currently serialize them by default and this could make them incompatible with the breakpoint/snapshot feature.

We should do something similar to #9869, where support for Enum was added.

@sjrl feel free to correct this or add details.

[Hansehart]

I can tackle this in this week.

[sjrl]

Hey @Hansehart, really appreciate your willingness to help! But this issue connects to some deeper codebase considerations, so our team will handle it directly. Feel free to check out Haystack - Contributions wanted (view) for other ways to contribute!