Library - Validate CBOR structs according to the cddl schema for cloud/enroll

[nazmulidris]

The ockam_api crate exchanges many structs with the Controller. Those structs are serialized using CBOR and should conform to the cddl schema.

Currently there are only a handful of structs tested for conformance to the schema:

• project (and related structs)
• space (and related structs)
• subscription (and related structs)

The purpose of this issue is to complete the testing by:

• adding more quickcheck properties similar to the ones above
• adding missing schema.cddl definitions where necessary
• additionally remove the lifetime annotations on structs, like this one (and replace CowStr<'a> with String)

To the following list of structs:

• cloud/enroll/AuthenticateOidcToken
• cloud/enroll/RequestEnrollmentToken
• cloud/enroll/EnrollmentToken
• cloud/enroll/AuthenticateEnrollmentToken

Note

Related epic: #6235

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