Proposing the addition of a missing command: 'getInAppData'

[marco-prontera]

Referring to the documentation relative to the In-App Details:

Global-Privacy-Platform/Core/CMP API Specification.md

Line 715 in 942c76d

## In-App Details

In particular, regarding the encoding of some specific types of values:

Global-Privacy-Platform/Core/CMP API Specification.md

Line 779 in 942c76d

Valid data types are Integer and String. All other data types such as Boolean, Date and Array (Range, Bitfield, Fibonacci-Range, …) should be converted into an Integer or String representation as follows:

I believe that a command that handle these requirement should be supported.
Maybe it can be named "getInAppData".
This would ensure that the GPP fully exposes all its standardized elements also at the implementation level.

I hope this proposal makes sense to you, thanks in advance!