refactor(package): comfystream to export server and pipeline

[eliteprox]

Exports the comfystream.pipeline and comfystream.server packages to make the pipeline and metrics usable in other applications

python
import pkgutil
import comfystream
print([name for _, name, _ in pkgutil.iter_modules(comfystream.__path__)])
['client', 'pipeline', 'scripts', 'server', 'tensor_cache', 'utils']

[pschroedl]

If we can come to a resolution on the import pattern, I will approve.

Previous concerns were addressed.