GH-24 - Allow /api path prefix

[auniverseaway]

• Support prefixing all routes with /api

Resolves: GH-24

How Has This Been Tested?

1. Passing unit tests
2. Validated da-admin only uses pathname provided by daCtx.

Screenshots (if appropriate):

Types of changes

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

Checklist:

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

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 100.00%. Comparing base (a350e1d) to head (1863498).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #25 +/- ## ========================================= Coverage 100.00% 100.00% ========================================= Files 4 4 Lines 219 221 +2 ========================================= + Hits 219 221 +2 ```

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