Module items count

[didoda]

This provides a feature: showing items count in modules.
Counters are loaded on first access to dashboard.
Cache data is updated per module when accessing the module index.
Examples follow.

Dashboard

Object view:

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.69%. Comparing base (fda3647) to head (a204013).
Report is 42 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #1136   +/-   ##
=========================================
  Coverage     99.68%   99.69%           
- Complexity     1254     1270   +16     
=========================================
  Files            95       95           
  Lines          4836     4891   +55     
=========================================
+ Hits           4821     4876   +55     
  Misses           15       15           

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