Really ugly work in progress hack to fix tests on Django@master

[matthiask]

Django 3.2 has changed a few internals in the django.core.cache module. Our instrumentation doesn't pick up cache calls anymore. Here's a hack which has worked locally. Since django-debug-toolbar relies on monkey patching anyway, something like this may work.

(Test failures on released Django versions are to be expected.)

[tim-schilling]

I think in order to commit this, we'd need to figure out a way to have the cache tracking disabled.

[tim-schilling]

This will enable the cache panel for the middleware by default. I don't think it's possible to avoid that and still capture the middleware cache calls before the toolbar's middleware.

[codecov]

Codecov Report

Merging #1427 (78bcb93) into master (e5835ec) will increase coverage by 0.15%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1427      +/-   ##
==========================================
+ Coverage   87.44%   87.60%   +0.15%     
==========================================
  Files          29       29              
  Lines        1577     1581       +4     
  Branches      220      220              
==========================================
+ Hits         1379     1385       +6     
+ Misses        146      145       -1     
+ Partials       52       51       -1     

Impacted Files	Coverage Δ
debug_toolbar/panels/cache.py	84.05% <100.00%> (+0.47%)	⬆️
debug_toolbar/panels/sql/views.py	90.62% <0.00%> (+3.12%)	⬆️

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[tim-schilling]

With #1437 merged, this can be closed.