MG-2302 - Fix bootstrap config with multiple channels

[nyagamunene]

What type of PR is this?

This is a bug fix because it fixes the following issue: absmach/magistrala#12

What does this do?

This changed how the connect handler and disconnect handler are implemented and introduces a retrieve channels method in the repo layer.

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

• Related Issue Bug: In a bootstrap config with multiple channels, bootstrap state goes to 1, if any one of the channel connect to thing magistrala#12
• Resolves Bug: In a bootstrap config with multiple channels, bootstrap state goes to 1, if any one of the channel connect to thing magistrala#12

Have you included tests for your changes?

Yes, I have included tests for my changes.

Did you document any new/modified feature?

N/A

Notes