Replace SetupOptions with `inp::FrameworkInput`

[sethrj]

The parameter setup that's evolved in accel is fragile and half-duplicated in several other places in the code. We want migrate to using the inp data structures.

UI integration:

• [ ] Add G4UI wrapper class that stores values into a JSON object (refactoring SetupOptionMessenger as needed)
• [ ] Add JSON converters for the key celeritas configuration classes (system, scoring, control)

Input integration:

• [ ] Have SetOptions convert immediately to inp, have SharedParams take FrameworkInput (and for backward compatibility, leave setupoptions)
• [ ] Add a SetInput method to IntegrationBase
• [ ] At initialize, apply UI json options to stored input, then reset UI options