[MEX-691] Weekly rewards and timekeeping cache warmers

[mad2sm0key]

Reasoning

• week timekeeping data for farms, fees collector and staking contracts is used in various computations for user queries. The current implementation fetches this data on user request only, causing poor performance

Proposed Changes

• added 2 new cache warmers for week timekeeping and weekly rewards splitting data (for farms, staking and fees collector)
• small fix for certain fields returning "NaN" (division by 0)

How to test

• N/A

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 52.82%. Comparing base (87683b0) to head (6907eda).
Report is 70 commits behind head on development.

Additional details and impacted files

@@               Coverage Diff               @@
##           development    #1565      +/-   ##
===============================================
- Coverage        52.90%   52.82%   -0.09%     
===============================================
  Files              269      270       +1     
  Lines            10656    10694      +38     
  Branches           825      830       +5     
===============================================
+ Hits              5638     5649      +11     
- Misses            4278     4303      +25     
- Partials           740      742       +2     

Flag	Coverage Δ
unittests	52.82% <100.00%> (-0.09%)	⬇️

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