feat(afj): initial support for afj agent

[berendsliedrecht]

• Adds support for an afj agent
• Errors when an agent does not implement the subcommand
• Removed some colored output (we can add it back if we have a consistent pattern for it)
• Implemented schema only for afj to test (does not work as the agent I used required some login or something)
• No version support yet (still have to figure this out)
• No breaking changes for aca-py users
• Adds agent key to the environment
  • accepts aca-py and afj and if its none, aca-py is selected
• Might contain some minor bugs but I have done some testing and I did not find any issues.

[jloleysens]

This looks great @blu3beri ! I left a question about the current structure of the new Agent structure.

[jloleysens]

It'd be nice if we could remove the nested agent here. I see we originally use impl TraitX, does that no longer work? For example:

https://play.rust-lang.org/?version=stable&mode=debug&edition=2021&gist=76fe7705e6b59d29aaa03e3993c31327

[jloleysens]

That way we can just pass the instantiated agent objects around directly, or do the return types of the functions diverge too much? Enlighten me to the rusty ways.

[berendsliedrecht]

Yes you are correct, this was slightly left over from when I wanted to do a better match based on the commands... But Rust does not allow you to return Agent<A> and Agent<B> from seperate match arms as they are not the same type.

[morrieinmaas]

Just left a few comments (that you have addressed already🙌). Nice job!

[berendsliedrecht]

@jloleysens any other notes or is it ready to be merged?