Added cloud analysis for chess positions

[kaustubhk334]

Added functionallity for the /api/cloud-eval endpoint of the lichess API. Provides cached analysis of up to 7 million positions in the lichess database.

[codecov-io]

Codecov Report

Merging #21 (d05e023) into master (1b000a4) will decrease coverage by 0.32%.
The diff coverage is 33.33%.

@@            Coverage Diff             @@
##           master      #21      +/-   ##
==========================================
- Coverage   70.04%   69.71%   -0.33%     
==========================================
  Files           8        8              
  Lines         671      677       +6     
==========================================
+ Hits          470      472       +2     
- Misses        201      205       +4     

Impacted Files	Coverage Δ
berserk/clients.py	33.69% <33.33%> (-0.01%)	⬇️

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