NOISSUE - Group service middleware into single folder

[felixgateru]

What type of PR is this?

This is a refactor as it groups current service middleware.

What does this do?

This pr creates the following folder structure for magistrala services: service -- middleware ---- logging.go ---- metrics.go ---- tracing.go ---- doc.go

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

Noissue

Have you included tests for your changes?

No

Did you document any new/modified feature?

Yes changes include godoc documentation

Notes

To be merged after #2444