RO Membrane Channel Cleanup

[bknueven]

Fixes/Resolves: N/A

Summary/Motivation:

Cleanup in RO unit models from #245 -- lots of attributes were moved to the membrane channel, this PR completes the move in the remainder of the WaterTAP codebase

Changes proposed in this PR:

• delete most references on RO unit models
• update WaterTAP to use attributes on feed_side
• update RO documention

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[codecov]

Codecov Report

Merging #716 (fc09d78) into main (92f6ab3) will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #716      +/-   ##
==========================================
- Coverage   95.63%   95.63%   -0.01%     
==========================================
  Files         254      254              
  Lines       24342    24327      -15     
==========================================
- Hits        23280    23265      -15     
  Misses       1062     1062              

Impacted Files	Coverage Δ
...ith_energy_recovery/monte_carlo_sampling_RO_ERD.py	96.96% <ø> (ø)
watertap/examples/flowsheets/lsrro/multi_sweep.py	95.18% <ø> (ø)
watertap/unit_models/reverse_osmosis_0D.py	98.50% <ø> (ø)
...RO_with_energy_recovery/RO_with_energy_recovery.py	91.01% <100.00%> (ø)
...awater_RO_desalination/seawater_RO_desalination.py	95.25% <100.00%> (ø)
...covery/dye_desalination/dye_desalination_withRO.py	99.67% <100.00%> (ø)
...er_resource_recovery/dye_desalination/dye_sweep.py	97.75% <100.00%> (ø)
...treatment_train/analysis/flowsheet_single_stage.py	96.15% <100.00%> (ø)
...ll_treatment_train/analysis/flowsheet_two_stage.py	92.30% <100.00%> (ø)
...full_treatment_train/model_components/unit_0DRO.py	91.11% <100.00%> (ø)
... and 4 more

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[adam-a-a]

LGTM