Adding prefix endpoint to retry

[astrinh0]

Description

This change is for add an option to add a prefix endpoint on retry items and queues

Fixes #140

How Has This Been Tested?

This was tested manually, unit tests and integration cannot test this because this is a protected property and I think should stay like this.

Checklist

• [ x ] My code follows the style guidelines of this project
• [ x ] I have performed a self-review of my code
• [ ] I have added tests to cover my changes
• [ x ] I have made corresponding changes to the documentation

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