Update from the discussion on Issue #1

[yambottle]

Points that need to improve:

1. Change package name from +neuropixels to +npxtoolkit
2. ClassDiagram 1 - 1...0 relationship should be 1 - *, also updated UsecaseDiagram to resolve some confusion
3. Add an Assembly class as the top level object, also changed Pipeline to Session in order to avoid concept conflicts
4. Now the object level will be Assembly->Session->Stage->JobBase
5. Change function assemble() to add_session() to avoid confusion
6. Include log4m at +npxtoolkit/+internal/+logging/
7. Will work on the 'non-fork' repo

[yambottle]

@dimitri-yatsenko @iamamutt Please take a look when you guys are available, I made those changes followed by the discussion in Issue 1

[iamamutt]

I think the class design is pretty clear. I think later down the line we may want to simplify launch.m. Maybe providing some helper functions to wrap up some of the steps. I know this this is the way it kind of is in ecephys so if we just want to try to stick to that then this may be okay.