added transform to fix rsoxs descriptor

[gwbischof]

I tested a bit with real rsoxs data.. until i ran out of RAM.

[gwbischof]

Fixes #82

[gwbischof]

based on the PR: bluesky/databroker#474 I thought I was going to have to swap the x,y dims. But i was getting shape errors when I did that.

[codecov-io]

Codecov Report

Merging #83 into master will decrease coverage by 2.47%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #83      +/-   ##
==========================================
- Coverage   55.87%   53.39%   -2.48%     
==========================================
  Files          13       13              
  Lines         809      809              
==========================================
- Hits          452      432      -20     
- Misses        357      377      +20     

Impacted Files	Coverage Δ
nslsii/tests/temperature_controllers_test.py	66.66% <0.00%> (-33.34%)	⬇️
nslsii/temperature_controllers.py	63.26% <0.00%> (-30.62%)	⬇️
nslsii/_version.py	44.40% <0.00%> (+1.80%)	⬆️

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[gwbischof]

I made the helper functions, because I suspect that other descriptor transforms will use them too