Missing feature to specify attributes on GenStruct

[mscofield0]

My use case is the following: I would like to derive a macro for my enum and then for each struct-field variant generate an identical struct which the same attributes as the enum (Clone, Debug, etc...).

[VictorKoenders]

Should be pretty easy:

• Add a field to the GenStruct struct
• Add functions to that struct to add attributes
• Add documentations that also test the output, see this for an example