Add action/filters to the report export meta boxes and classes to allow them to be easily extendable

[arraypress]

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Enhancement Request

Explain your enhancement (please be detailed)

For the sake of UI/UX, it would useful to be able to extend both the report export meta boxes to add new fields (such as select drop downs) and also filter the query args in the report classes themselves.

See this example:

I have 3 plugins built that have custom reports, but with the exception of one, they all essentially look for some meta data in the orders and filter based on that. It would be useful to be able to just add a drop down to the export orders meta box (already part of EDD) and add a drop down to select what you want to export (coupon or upsell orders for example).

Justification or use case

Much cleaner UI/UX, better third-party integration.

[arraypress]

This probably explains it a bit better :)