Improve ResponsePickerApi type

[snamoah]

Background

Currently ResourcePickerApi is incorrectly returning SelectPayload<'product' | 'variant' | 'collection'> type even when type: 'product' is passed to the resourcePIcker. See screenshot below showing before and after

Solution

Add generic constraints to ResourcePickerApi function type so that the return type is based on the type option passed as parameter.

Before

After

🎩

• ...

Checklist

• I have 🎩'd these changes
• I have updated relevant documentation

[github-actions]

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