Use django cache with large-image

[banesullivan]

requires https://github.com/girder/large_image/pull/876

resolves #2

To do:

• [x] add some sort of test that will validate that large-image is really using the Django cache

[codecov[bot]]

Codecov Report

Merging #32 (e404c8f) into main (e39d46c) will increase coverage by 0.05%. The diff coverage is 83.72%.

@@            Coverage Diff             @@
##             main      #32      +/-   ##
==========================================
+ Coverage   94.69%   94.75%   +0.05%     
==========================================
  Files          15       16       +1     
  Lines         622      648      +26     
==========================================
+ Hits          589      614      +25     
- Misses         33       34       +1