Add the ability to manually set a session id when creating a new session #167

Describe the feature or problem you'd like to solve

A user creates a docker container with copilot cli available on it. The user sends a copilot -p command to the container to get a response from the agent. Ideally, future prompts from the user would use the same session. --resume <session-id> is available, but we don't know the right session id, and can only discover it using the interactive --resume command.

Proposed solution

I can think of a couple options that would work:

1. Allow users to optionally specify a session id via a command line argument, like copilot -p <prompt> --session-id <session-id>
2. Add a command line argument to run in the "previous session", like copilot -p <prompt> --prev-session

Example prompts or workflows

Option 1:
User creates a docker container with copilot running
User sends copilot -p <prompt> --session-id <session-id> to start a new session
User sends a follow-up prompt with the --resume option to resume the previously created session, copilot -p <prompt> --session-id <session-id>

Option 2:
User creates a docker container with copilot running
User sends copilot -p <prompt> to the container to start a new session
User sends a follow-up prompt with a flag indicating to re-use the last session copilot -p <prompt>--prev-session

Additional context

No response