[WIP: don't review] New storage in network planner CLI

[dwhswenson]

This will add a flag to use our new storage to output an alchemical network in the CLI network planners. For now, this option is hidden (doesn't show in --help), so we have full freedom to change the UX later. That way we can dogfood new storage with actual release code.

As of pushing the PR, nothing is actually hooked into storage. Just giving a heads-up that I'll be working on it.

[codecov]

Codecov Report

Patch coverage: 72.18% and project coverage change: -0.39 ⚠️

Comparison is base (9e6766e) 91.99% compared to head (abed241) 91.61%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #470      +/-   ##
==========================================
- Coverage   91.99%   91.61%   -0.39%     
==========================================
  Files         106      110       +4     
  Lines        6324     6557     +233     
==========================================
+ Hits         5818     6007     +189     
- Misses        506      550      +44     

Impacted Files	Coverage Δ
openfe/setup/atom_mapping/ligandatommapper.py	91.66% <ø> (-0.65%)	⬇️
openfe/tests/conftest.py	100.00% <ø> (ø)
openfe/utils/handle_trajectories.py	0.00% <0.00%> (ø)
openfecli/tests/commands/test_gather.py	100.00% <ø> (ø)
openfecli/commands/plan_rbfe_network.py	93.44% <66.66%> (-4.71%)	⬇️
openfe/tests/protocols/test_openmmutils.py	96.72% <78.57%> (-3.28%)	⬇️
openfecli/commands/gather.py	92.04% <88.46%> (+6.12%)	⬆️
openfe/protocols/openmm_rfe/_rfe_utils/relative.py	83.06% <95.00%> (+1.00%)	⬆️
openfe/protocols/openmm_rfe/equil_rfe_methods.py	93.87% <100.00%> (+4.34%)	⬆️
openfe/protocols/openmm_rfe/equil_rfe_settings.py	86.82% <100.00%> (+5.54%)	⬆️
... and 10 more

... and 1 file with indirect coverage changes

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