FEAT compatiblity of SeedPromptDataset with send_prompt[s]_async

[romanlutz]

Is your feature request related to a problem? Please describe.

With our new SeedPrompt objects and SeedPromptDatasets there's an extra step required to plug them into the send methods which is painful.

Example:

adv_bench_prompts = fetch_adv_bench_dataset()
prompts = [prompt.value for prompt in adv_bench_prompts.prompts[:3]]
await orchestrator.send_prompts_async(prompt_list=prompts)  # type: ignore

Describe the solution you'd like

Instead of the middle step, there should either be
a) a way to plug in SeedPromptDatasets into send_prompts_async and the send method can extract the prompts from the dataset OR
b) there needs to be a simple access method, something like get_values() on the SeedPromptDataset class.

The latter seems a tad simpler.

Describe alternatives you've considered, if relevant

Additional context