Better naming for outputs with DTOs

[MLDMoritz]

Description
When using a DTO as an output, the name generated for that Model is not readable, it's a hash. The name should be more readable, eg. filename.

Example

With "output"=RequestPasswordResetRequestResult::class

Current version generates names like this: RequestPasswordResetRequest:7f546cb601bbd9e0eb1a7cfa305ea7fb

output should be
RequestPasswordResetRequest:RequestPasswordResetRequestResult
or
RequestPasswordResetRequestResult

[teohhanhui]

See #2487