feat: Edge authentication

[alespour]

Closes #88

Proposed Changes

Briefly describe your proposed changes:

Refactored #88, based on my comments there:

• does not modify client-provided config instance (by setting fallback value to unset property)
• renamed property TokenPrefix -> AuthScheme per terminology used eg. in https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Authorization
• AuthScheme also supported in Client init from connection string and/or environment variables

Checklist

• [x] CHANGELOG.md updated
• [x] Rebased/mergeable
• [x] A test has been added if appropriate
• [x] Tests pass
• [x] Commit messages are conventional

[codecov[bot]]

Codecov Report

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

Project coverage is 84.62%. Comparing base (1c6ab94) to head (0cb1038).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #91 +/- ## ========================================== + Coverage 84.48% 84.62% +0.14% ========================================== Files 14 14 Lines 1096 1106 +10 ========================================== + Hits 926 936 +10 Misses 140 140 Partials 30 30 ```

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