chore: unify cache events api

[nogringo]

Pull request for issue #299

[codecov]

Codecov Report

❌ Patch coverage is 72.22222% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 71.68%. Comparing base (2174eb4) to head (75228ab).
⚠️ Report is 4 commits behind head on master.

Files with missing lines	Patch %	Lines
.../repositories/cache_manager/mem_cache_manager.dart	72.22%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #355      +/-   ##
==========================================
+ Coverage   71.62%   71.68%   +0.05%     
==========================================
  Files         142      142              
  Lines        5287     5301      +14     
==========================================
+ Hits         3787     3800      +13     
- Misses       1500     1501       +1     

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