Port modal aerosol model (MAM) to CCPP and move to atmos_phys

### Issue Type

Infrastructure Update

### Issue Description

This is the "main" issue tracking MAM port to CAM.

It is envisioned this will include at least the following schemes:

- [x] modal_aero_calcsize
- [x] modal_aero_wateruptake
- [x] aero_model_drydep
- [x] aero_model_wetdep
- [x] ... aero_convproc
- [x] ..... aero_activate (shared core with ndrop)
- [x] ... wetdep (shared core with gas-phase chem)
- [x] **Microphysics block:**
- [x] mo_setsox
- [x] ... sox_cldaero
- [x] modal_aero_gasaerexch
- [x] modal_aero_rename
- [x] modal_aero_newnuc
- [x] modal_aero_coag
- [ ] **modal_aero_surfdens** (on hold while Francis is refactoring chemistry path)
- [x] **Emissions block:**
- [x] dust_model
- [x] ... dust_sediment_mod
- [x] modal_seasalt_emissions
- [x] ... sslt_sections
- [ ] **microp_aero block:** microp_aero_mam
- [x] nucleate_ice_cam (shared with BAM/MAM/CARMA)
- [ ] hetfrz_classnuc (on hold; not used for CAM5; upstream science expected)
- [ ] conv_water_4rad (diag only?)

### Will this change answers?

No

### Will you be implementing this yourself?

Yes