[Profiles API] NetworkProfileId is a string but format is not yet specified

[rkandoi]

Check if NetworkProfileId should be made a UUID

[tlohmar]

Comment from the review: string type should be restricted, e.g. to uuid if it is really an id and not a name

Proposal:

• Enforce a minimal length, e.g. 3 characters
• Limit the maximal length, e.g. 256 characters
• Only allow a pattern, e.g. ^[a-zA-Z0-9_.-]+$, which allows UUID style ProfileIds or more human readable names (like Profile_HQ).

[tlohmar]

To be consistent with the other DN APIs, we should use format UUID for the NetworkProfileId and add a human readable name.