MG-2304 - Add endpoint to verify thing channel connection

[nyagamunene]

What type of PR is this?

This PR adds functionality to verify the connection between a channel and a thing by providing a dedicated endpoint.

What does this PR do?

• Implements a VerifyConnection service.
• Adds an endpoint to utilize the VerifyConnection service.
• Includes tests to ensure the correctness of the new functionality.

Which issue(s) does this PR fix/relate to?

• Related Issue: #2304
• Resolves: #2304

Have you included tests for your changes?

Yes, tests have been included.

Did you document any new or modified features?

Yes, documentation has been updated to reflect the new feature.

Notes