Feature: add analytics controller with endpoints for users, ontologies and pages

[syphax-bouazzouni]

Prerequisites

• Fix: Google analytics new version and add users analytics  ontologies_linked_data#118

Changes

• Add /data/analytics/ontologies endpoint, to get ontologies visits evolution by time.
• Add /data/analytics/users endpoint, to get users visits evolution by time.
• Add /data/analytics/page_visits endpoint, to get top pages visited in the current month.

[codecov]

Codecov Report

Attention: 22 lines in your changes are missing coverage. Please review.

Comparison is base (72813a0) 71.17% compared to head (236adf5) 70.76%.

Files	Patch %	Lines
controllers/analytics_controller.rb	21.42%	22 Missing ⚠️

Additional details and impacted files

@@               Coverage Diff               @@
##           development      #63      +/-   ##
===============================================
- Coverage        71.17%   70.76%   -0.41%     
===============================================
  Files               64       65       +1     
  Lines             3393     3421      +28     
===============================================
+ Hits              2415     2421       +6     
- Misses             978     1000      +22     

Flag	Coverage Δ
unittests	70.76% <26.66%> (-0.41%)	⬇️

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