Implement a sequential agent and a parallel agent

[dgageot]

See #862

• A sequential agent is probably a special case of the loop agent with only 1 iteration. Keeping the exit conditions can be useful
• A parallel agent calls sub agents concurrently, with the same input. It them collects all the outputs and arranges them in the order of the agents, no matter in what order those gave their response.

[riturajFi]

Hi @dgageot @rumpl @krissetto , this is very interesting - would love to work on it!

[riturajFi]

Hi @dgageot @rumpl @krissetto , this is very interesting - would love to work on it!``

[krissetto]

Hey @riturajFi! I wouldn't take this issue right now, we're trying to scope things out here and figure out exactly how we'd like these features to work

[riturajFi]

Sure @krissetto , i just want to make some contributions to some core agent/tool related issue with good impact. Would love it if you could assing something to me