Refactor Exporters & Data Adapter

[Sancretor]

Is your feature request related to a problem? Please describe.

Exporters & DataAdapter classes are huge and messy thanks to the many years of lazy additions by multiple people. :)
If anyone wanted to contribute, this mess could unfortunately be a big "NO WAY" sign !
We need to reduce this painful technical debt.

Describe the solution you'd like

It could be great to split them in multiple smaller functions/classes/files in order to ease their maintainability and correctly test them.

Describe alternatives you've considered

Don't do anything, this monster is too awful ... but we are brave (right ?), so refactor all this please. :)