BREAKING CHANGE: LicensesService.List now accepts ListLicensesOptions parameter for pagination.

1. Add missing ListLicensesOptions to LicensesService.List, see the query parameters.
2. Generate iterator method LicensesService.ListIter.
3. Add an integration test TestLicenses_ListIter showing that LicensesService.List is called at least twice. We have page: 1, per_page: 1, and number of featured licenses: 3. I think it's a good integration test because featured licenses change rarely.

Updates #3976

Codecov Report

❌ Patch coverage is 91.30435% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 93.52%. Comparing base (5bdc954) to head (3861b4a).
⚠️ Report is 4 commits behind head on master.

@@            Coverage Diff             @@
##           master    #3981      +/-   ##
==========================================
- Coverage   93.52%   93.52%   -0.01%     
==========================================
  Files         207      207              
  Lines       17569    17590      +21     
==========================================
+ Hits        16432    16451      +19     
- Misses        937      938       +1     
- Partials      200      201       +1     

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It's impossible to cover the line return nil, nil, err.

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