Add users engagement API methods

[jadolg]

https://developer.rocket.chat/apidocs/users-engagement-api

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.40%. Comparing base (396c278) to head (b1cd69b).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #369      +/-   ##
==========================================
+ Coverage   99.39%   99.40%   +0.01%     
==========================================
  Files          45       47       +2     
  Lines        2328     2368      +40     
  Branches      151      151              
==========================================
+ Hits         2314     2354      +40     
  Misses         10       10              
  Partials        4        4              

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