Prevent OOM due to caching values >1MB

[Brutus5000]

@Sheikah45 I'd love to see a cross-check whether we cover all "client startup calls" correctly

[codecov]

Codecov Report

Merging #705 (b8bb530) into develop (2d2d8c5) will decrease coverage by 0.07%.
The diff coverage is 0.00%.

Additional details and impacted files

@@              Coverage Diff              @@
##             develop     #705      +/-   ##
=============================================
- Coverage      76.18%   76.12%   -0.07%     
  Complexity      1166     1166              
=============================================
  Files            245      245              
  Lines           3746     3749       +3     
  Branches         233      233              
=============================================
  Hits            2854     2854              
- Misses           794      797       +3     
  Partials          98       98              

Impacted Files	Coverage Δ
...ain/java/com/faforever/api/config/CacheConfig.java	0.00% <0.00%> (ø)

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[Sheikah45]

What do you mean by startup calls?

The only call the client makes on startup is to /me.

The only other critical one is the featured mods and coturn endpoints so people can start a game

[Brutus5000]

Avatars and/or players or ratings after joining chat? Maps / mods that are in the current game list?

[Sheikah45]

On that basis I think the ones I don't understand are the avatar assignment. As that is going to be different for everyone, it is also an infrequent call so may not even be worth caching. And then also the leaderboard rating I am not sure of either.

The map statistics isn't used by the client either I believe.