Add Cacheable URLs for FeatureModFiles

[Sheikah45]

This adds separation of the hmac token, param, and a cacheable url so that clients can send the hmac verification as a request header which allows caching of the request in cloudflare since there is no longer any query parameters

[codecov]

Codecov Report

Merging #638 (42b3281) into develop (436a4b0) will increase coverage by 0.05%.
The diff coverage is 100.00%.

❗ Current head 42b3281 differs from pull request most recent head aa65114. Consider uploading reports for the commit aa65114 to get more accurate results

@@              Coverage Diff              @@
##             develop     #638      +/-   ##
=============================================
+ Coverage      76.19%   76.25%   +0.05%     
- Complexity      1162     1166       +4     
=============================================
  Files            244      245       +1     
  Lines           3684     3693       +9     
  Branches         232      232              
=============================================
+ Hits            2807     2816       +9     
  Misses           780      780              
  Partials          97       97              

Impacted Files	Coverage Δ
...om/faforever/api/cloudflare/CloudflareService.java	100.00% <100.00%> (ø)
...om/faforever/api/featuredmods/FeaturedModFile.java	100.00% <100.00%> (ø)
...ever/api/featuredmods/FeaturedModFileEnricher.java	100.00% <100.00%> (ø)
...rever/api/featuredmods/FeaturedModsController.java	85.00% <100.00%> (ø)

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[Brutus5000]

this should be done on initializing the bean

[Sheikah45]

ah good point

[Sheikah45]

@Brutus5000 is this good now?