[#889] Optimize cases listview

[vaszig]

Further optimization can be done when we solve the problem with parallel requests in tests.

• Only required case types are fetched (we were retrieving all of them)
• Cache is used for case types, status types and current statuses

[codecov-commenter]

Codecov Report

Merging #336 (9efb177) into develop (d5c38f5) will increase coverage by 0.01%.
The diff coverage is 94.91%.

@@             Coverage Diff             @@
##           develop     #336      +/-   ##
===========================================
+ Coverage    96.41%   96.43%   +0.01%     
===========================================
  Files          433      433              
  Lines        13131    13278     +147     
===========================================
+ Hits         12660    12804     +144     
- Misses         471      474       +3     

Impacted Files	Coverage Δ
src/open_inwoner/openzaak/cases.py	67.85% <53.84%> (-4.53%)	⬇️
src/open_inwoner/openzaak/utils.py	92.59% <91.17%> (-2.41%)	⬇️
src/open_inwoner/accounts/views/cases.py	99.30% <100.00%> (+0.04%)	⬆️
src/open_inwoner/openzaak/catalog.py	61.81% <100.00%> (+4.24%)	⬆️
src/open_inwoner/openzaak/tests/test_cases.py	100.00% <100.00%> (ø)

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[Bartvaderkin]

Nice cache function with the custom key.

One generic feedback I have left is maybe we should move the cached cases retrieval code in a function or a method because it is growing and taking over the get_context_data() method a bit.

[vaszig]

As discussed during our meeting I am going to update the code according to Bart's comments and I will add some explanation to the cache decorator as well. So, I am sorry Anna but I will need some more time before being able to merge this!

[annashamray]

Looks nice and neat!

[alextreme]

🙈