WIP: MQTT/Websocket support for C8y

[jarhodes314]

Proposed changes

This was part of #3531 (and at the time of writing, is an exact copy of that), but I'm just creating a PR for this to make sure I can easily find the branch again so the websocket elements can be merged separately.

To enable websocket support, enable basic authentication, then run:

tedge config set c8y.bridge.protocol ws

You should get an error if websockets are enabled and you haven't configured basic auth.

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. You can activate automatic signing by running just prepare-dev once)
• I ran just format as mentioned in CODING_GUIDELINES
• I used just check 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

Attention: Patch coverage is 27.08333% with 35 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
crates/core/tedge_mapper/src/c8y/mapper.rs	0.00%	25 Missing ⚠️
...common/tedge_config/src/tedge_toml/tedge_config.rs	68.42%	0 Missing and 6 partials ⚠️
crates/extensions/tedge_mqtt_bridge/src/config.rs	0.00%	3 Missing ⚠️
.../common/tedge_config/src/tedge_toml/models/auto.rs	0.00%	0 Missing and 1 partial ⚠️

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