[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

Attention: Patch coverage is 72.72727% with 3 lines in your changes missing coverage. Please review.

Project coverage is 91.61%. Comparing base (e62b214) to head (abed241).
Report is 1344 commits behind head on main.

Files with missing lines	Patch %	Lines
openfecli/commands/plan_rbfe_network.py	66.66%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #470      +/-   ##
==========================================
- Coverage   91.64%   91.61%   -0.04%     
==========================================
  Files         110      110              
  Lines        6549     6557       +8     
==========================================
+ Hits         6002     6007       +5     
- Misses        547      550       +3     

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