Added implementation of new webhook type

[EduardDumitru]

Motivation

Which issue does this fix? Fixes #issue number

Checklist

• Code follows coding conventions held in this repo
• Automated tests have been added
• Tests are passing
• Docs have been updated (if applicable)
• Temporary settings (e.g. variables used during development and testing) have been reverted to defaults

[pokornyd]

Hello Eduard, thank you for your PR submission. I'll review the proposed changes and get back to you with updates.

[codecov]

Codecov Report

Attention: Patch coverage is 94.44444% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 33.72%. Comparing base (7101db3) to head (00c988b).
Report is 5 commits behind head on master.

Files	Patch %	Lines
...ore/Webhooks/Models/Legacy/DeliveryWebhookModel.cs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #14      +/-   ##
==========================================
- Coverage   34.21%   33.72%   -0.49%     
==========================================
  Files          10       11       +1     
  Lines         152      169      +17     
  Branches       12       12              
==========================================
+ Hits           52       57       +5     
- Misses        100      111      +11     
- Partials        0        1       +1     

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