Feat add agent manager

[iFurySt]

modified includes:

• add agent manager to manage all agents;
• extract the host ssh port to prevent conflict.
• clean all containers with the prefix sandbox-

[iFurySt]

do we decide to merge this? it can't create a new container if previous container is still exist, the hardcode host port 2222 will cause the problem.

[rbren]

Yes, I think this fixes a lot of minor problems with the SSHBox (hard coded port, lingering containers)

[iFurySt]

i've resolved the conflicts, appreciate it if you have time to merge it.

[rbren]

A few quick notes:

• I changed the prefix to opendevin-sandbox-, which should be a little safer
• If we instantiate multiple sandboxes in the future, the cleanups might fight each other...may need to rethink that eventually

[rbren]

Will merge once tests pass

[katmai]

i'm getting an error when starting. noted it here: https://github.com/OpenDevin/OpenDevin/issues/1050