Iterative probe base class and example

[aishwaryap]

This PR demonstrates a sample multi-turn probe. Since the primary value add of multi-turn probes is iteratively adapting the next turn based on the last response, this PR includes a base probe class to simplify this.

Verification

List the steps needed to make sure this thing works

• Supporting configuration such as generator configuration file

{
    "huggingface": {
        "torch_type": "float32"
    }
}

• Run the tests and ensure they pass python -m pytest tests/
• Verify the thing does what it should
• Verify the thing does not do what it should not
• Document the thing and how it works (Example)

[aishwaryap]

Closing this PR since we have decided to make a number of design changes to align with intended implementation style for multi turn probes. Will create a new PR with updated design.