Add option to enable authenticated /r/test calls

[sewagner-adobe]

Description

The goal is to enable authenticated /r/test calls while initializing the SDK. Although anonymous calls are fine when calling directly an ACC instance, in other cases when traversing a proxy, providing an authentication token may be suitable.

Related Issue

N/A

Motivation and Context

N/A

How Has This Been Tested?

Unit tests added

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• I have signed the Adobe Open Source CLA.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.