[WIP] info command

[dwhswenson]

This will create a command openpathsampling info which reports versions of OPS, the OPS CLI, and various tools OPS integrates with (or will report that the tool can't be found).

This isn't intended to be a full listing of OPS dependencies -- the installation manager (conda or pip) should still handle that. However, this might be extended to include other useful information (e.g., if OpenMM is installed, which platforms are available?) that helps debug user problems.

[codecov]

Codecov Report

Merging #47 (c93e3a4) into main (aadad12) will decrease coverage by 3.32%.
The diff coverage is 36.36%.

❗ Current head c93e3a4 differs from pull request most recent head 741ff87. Consider uploading reports for the commit 741ff87 to get more accurate results

@@             Coverage Diff             @@
##              main      #47      +/-   ##
===========================================
- Coverage   100.00%   96.67%   -3.33%     
===========================================
  Files           13       14       +1     
  Lines          599      632      +33     
===========================================
+ Hits           599      611      +12     
- Misses           0       21      +21     

Impacted Files	Coverage Δ
paths_cli/commands/info.py	36.36% <36.36%> (ø)

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