refactor: restore visibility of tedge api relied upon by thick edge

[jarhodes314]

Proposed changes

Thick edge depends on a few parts of the tedge crate library that were previously public but have since been made private in a refactoring PR. The goal of this is so thick edge can only do the parts of the connection process it cares about (e.g. the direct connection and mosquitto configuration) for connecting to c8y in an automated fashion. This PR restores the public visibility of those items.

Types of changes

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Improvement (general improvements like code refactoring that doesn't explicitly fix a bug or add any new functionality)
• Documentation Update (if none of the other choices apply)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Paste Link to the issue

Checklist

• I have read the CONTRIBUTING doc
• I have signed the CLA (in all commits with git commit -s)
• I ran cargo fmt as mentioned in CODING_GUIDELINES
• I used cargo clippy as mentioned in CODING_GUIDELINES
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)

Further comments

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Additional details and impacted files

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[github-actions]

Robot Results

✅ Passed	❌ Failed	⏭️ Skipped	Total	Pass %	⏱️ Duration
498	0	2	498	100	1h25m3.235162999s