Create separate project for field bus

[craig8]

Is your feature request related to a problem? Please describe. Currently with gridappsd-python dependent on cim-graph and cim-graph dependent on a version of gridappsd-python there is a circular reference that is really difficult to get around. cim-graph depends only on the connection for gridappd-python but not the other items, whilst it's only the field-messagebus that depends on cim-graph. By separating these into a secondary project/wheel we can avoid this issue.

Describe the solution you'd like Change gridappsd-python into a mono-repository which would have two different wheels being built out of it. See https://gitlab.com/craig81/poetry-monorepo as an example of what I would like to do.

Describe alternatives you've considered An alternative is to break this repo into multiple repositories, however I don't think that this is a good idea.

[craig8]

@afisher1 @AAndersn thoughts comments?

[craig8]

Superceeds @GRIDAPPSD/GOSS-GRIDAPPS-D

[poorva1209]

gridappsd-python and gridappsd-field-bus

[craig8]

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