feat(api): Update Add Task endpoint methods

[Martin005]

This PR makes several changes:

• Add methods for the "Add Task" endpoint in Crowdin Enterprise
• Add "_by_string_ids" methods for the "Add Task" endpoint in Crowdin.com
• Remove deprecated parameters for the forms in the "Add Task" endpoint in Crowdin.com
• Of course, add tests for all of the changes
• Fixes a few typos in the existing code

See individual commits for more reference 🙂

Closes #152

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.22%. Comparing base (4e5eeb6) to head (f7b5f95).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #190      +/-   ##
==========================================
+ Coverage   99.21%   99.22%   +0.02%     
==========================================
  Files         166      166              
  Lines        6519     6655     +136     
  Branches      149      141       -8     
==========================================
+ Hits         6467     6603     +136     
- Misses         36       37       +1     
+ Partials       16       15       -1     

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[andrii-bodnar]

@Martin005 awesome, thank you for the contribution! 🚀