Add search bar for coop leaderboard

[Kimo-s]

#2880

[codecov]

Codecov Report

Merging #3053 (f0039b7) into develop (8ddd12c) will decrease coverage by 0.01%.
Report is 4 commits behind head on develop.
The diff coverage is 61.11%.

❗ Current head f0039b7 differs from pull request most recent head 0a68fbb. Consider uploading reports for the commit 0a68fbb to get more accurate results

Additional details and impacted files

@@              Coverage Diff              @@
##             develop    #3053      +/-   ##
=============================================
- Coverage      58.91%   58.90%   -0.01%     
- Complexity      4458     4461       +3     
=============================================
  Files            558      558              
  Lines          20156    20206      +50     
  Branches        1034     1035       +1     
=============================================
+ Hits           11874    11902      +28     
- Misses          7736     7755      +19     
- Partials         546      549       +3     

Files	Coverage Δ
...java/com/faforever/client/coop/CoopController.java	55.26% <61.11%> (+0.44%)	⬆️

... and 9 files with indirect coverage changes

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