[easy] utility function to test equality of two sets of tick markers.

[ttung]

This works for both pixel and physical ticks.

[codecov-io]

Codecov Report

Merging #1691 into master will decrease coverage by 0.05%.
The diff coverage is 25%.

@@            Coverage Diff             @@
##           master    #1691      +/-   ##
==========================================
- Coverage   89.85%   89.79%   -0.06%     
==========================================
  Files         239      239              
  Lines        8966     8974       +8     
==========================================
+ Hits         8056     8058       +2     
- Misses        910      916       +6

Impacted Files	Coverage Δ
starfish/core/morphology/util.py	69.56% <25%> (-23.77%)	⬇️

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