dandi ls: Error if --schema is given with remote resource of different version

[jwodder]

Closes #485.

[codecov]

Codecov Report

Merging #489 (5298337) into master (b47e06e) will increase coverage by 0.06%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master     #489      +/-   ##
==========================================
+ Coverage   64.83%   64.89%   +0.06%     
==========================================
  Files          59       59              
  Lines        5991     5993       +2     
==========================================
+ Hits         3884     3889       +5     
+ Misses       2107     2104       -3     

Flag	Coverage Δ
unittests	64.89% <0.00%> (+0.06%)	⬆️

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Impacted Files	Coverage Δ
dandi/cli/cmd_ls.py	60.00% <0.00%> (-0.74%)	⬇️
dandi/_version.py	45.96% <0.00%> (+1.75%)	⬆️

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[yarikoptic]

Thanks, let's proceed