Looper should use hook/plugin system to construct pipestat config files

[donaldcampbelljr]

          Will proceed with having Looper construct a new pipestat config file from a given pipestat config file AND the pipeline interfaces. Looper will use that config file to construct pipestat manager objects. Future work will investigate using a `pre-project` hook to construct this namespace and associated config file.

Originally posted by @donaldcampbelljr in https://github.com/pepkit/looper/issues/412#issuecomment-1703219004