Give ls a --metadata option

[jwodder]

Closes #534.

[codecov]

Codecov Report

Merging #536 (277b60c) into master (cebdf86) will decrease coverage by 0.08%.
The diff coverage is 27.27%.

@@            Coverage Diff             @@
##           master     #536      +/-   ##
==========================================
- Coverage   83.52%   83.43%   -0.09%     
==========================================
  Files          62       62              
  Lines        6427     6436       +9     
==========================================
+ Hits         5368     5370       +2     
- Misses       1059     1066       +7     

Flag	Coverage Δ
unittests	83.43% <27.27%> (-0.09%)	⬇️

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Impacted Files	Coverage Δ
dandi/cli/cmd_ls.py	57.80% <27.27%> (-1.96%)	⬇️

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[yarikoptic]

Thank you, I guess we will just test it in action... proper python interface is anyway yet to come