Devfile parser should not return internal context from parse function

[adisky]

Is your feature request related to a problem? Please describe.
Currently Parse function in devfile parser returns DevfileObj which contains DevfileCtx, DevfileCtx is internal structure and not of any use for library consumer.

Describe the solution you'd like
Return Devfile Structure directly or if returning the interface, we can use simple wrapper instead of DevfileObj

type DevfileWrapper Struct {
 APIVersion String
 Data data.DevfileData
}

Describe alternatives you've considered
None I have thought of :)

Additional context
Not required

[github-actions]

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