Subscription Item object

[webtaken]

Main changes:

• Added Subscription Item object with all the structs related to the object.
• Added Subscription Items Service implementation (Get, Update, List, CurrentUsage).
• Added proper testing for the Subscription Items Service.

[codecov]

Codecov Report

Attention: 17 lines in your changes are missing coverage. Please review.

Comparison is base (e3a708e) 82.89% compared to head (fdabd6f) 81.26%.

❗ Current head fdabd6f differs from pull request most recent head f224f1c. Consider uploading reports for the commit f224f1c to get more accurate results

Files	Patch %	Lines
subscription_items_service.go	63.82%	10 Missing and 7 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #12      +/-   ##
==========================================
- Coverage   82.89%   81.26%   -1.64%     
==========================================
  Files          20       21       +1     
  Lines         491      539      +48     
==========================================
+ Hits          407      438      +31     
- Misses         42       52      +10     
- Partials       42       49       +7     

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[AchoArnold]

Thanks @webtaken