Add x-super-properties header

[MinnDevelopment]

Pull Request Etiquette

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• [ ] Library interface (affecting end-user code)
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Closes Issue: NaN

Description

This adds support for the X-Super-Properties header in JDA. This header is required to use certain features in the API that discord forgot about.

[MinnDevelopment]

This is required for #2532

[RedDaedalus]

It would be ideal if this were configurable to some degree -- newer features will be gated to later minimum app versions.

[MinnDevelopment]

It would be ideal if this were configurable to some degree -- newer features will be gated to later minimum app versions.

Headers can already be customized with setRestConfig by setting a custom builder.