Adding signals & queries to the basic Bedrock sample. Starts a workflow with a prompt, allows follow-up prompts to be given using Temporal signals, and allows the conversation history to be queried using Temporal queries.

To run, first see samples-python README.md, and bedrock README.md for prerequisites specific to this sample. Once set up, run the following from the root directory:

1. Run the worker: uv run bedrock/signals_and_queries/run_worker.py

2. In another terminal run the client with a prompt.

   Example: uv run bedrock/signals_and_queries/send_message.py 'What animals are marsupials?'

3. View the worker's output for the response.

4. Give followup prompts by signaling the workflow.

   Example: uv run bedrock/signals_and_queries/send_message.py 'Do they lay eggs?'

5. Get the conversation history by querying the workflow.

   Example: uv run bedrock/signals_and_queries/get_history.py

6. The workflow will timeout after inactivity.