Fix validation northbound cm handle searches

Fix validation northbound cm handle searches

- Renamed related methods and Enum using terms north (client facing) and southbound (dmi) for more clarity
- Northbound Cm Handle search was using the wrong Enum for validation (this caused the issue)
- Grouped and ordered renamed methods in facade impl
- Enums also had the wrong values: unsupported values in one and missing values in the other
  (southbound can/should support all possible queries, no reason not too)
TODO (separate subtasks and commits)
- Update RTD documentation to properly describe options in each ifc
- Update Postman collection to have cleared separation between north and southbound interfaces

Issue-ID: CPS-2864
Change-Id: I6523b368e504b5e99dde794e7e716193d2cadf23
Signed-off-by: ToineSiebelink <toine.siebelink@est.tech>