feat(api): add Task Settings Templates API + tests

[innomaxx]

Closes #118

[codecov-commenter]

Codecov Report

Merging #151 (2aef149) into master (eb393ac) will increase coverage by 0.39%.
The diff coverage is 80.44%.

@@             Coverage Diff              @@
##             master     #151      +/-   ##
============================================
+ Coverage     50.07%   50.46%   +0.39%     
- Complexity      801      820      +19     
============================================
  Files           387      393       +6     
  Lines          3593     3639      +46     
  Branches         91       91              
============================================
+ Hits           1799     1836      +37     
- Misses         1773     1782       +9     
  Partials         21       21              

Impacted Files	Coverage Δ
...nt/tasks/model/AddTaskSettingsTemplateRequest.java	0.00% <0.00%> (ø)
...client/tasks/model/TaskSettingsTemplateConfig.java	50.00% <50.00%> (ø)
...asks/model/TaskSettingsTemplateResponseObject.java	50.00% <50.00%> (ø)
...owdin/client/tasks/model/TaskSettingsTemplate.java	66.67% <66.67%> (ø)
.../crowdin/client/tasks/model/LanguageReference.java	75.00% <75.00%> (ø)
.../tasks/model/TaskSettingsTemplateResponseList.java	88.89% <88.89%> (ø)
...c/main/java/com/crowdin/client/tasks/TasksApi.java	96.08% <100.00%> (+2.54%)	⬆️