* Adding contants, renaming files, wiring up shipping section with discrete slots for variants and non-variants
* Refactoring pricing section to give discrete slots for variant and non-variant forms
* Refactoring inventory fills to give discrete slots for variant and non-variant products
* Adding additional slot to pricing -> taxes -> advanced
* Renaming api fields component file
* Refactoring images, details and attributes to match others
* Ensure variant field IDs are distinct, organize all product field fill IDs
* Adding changelog
* Simplifying IDs used for slots
* Minor refactor of pricing taxes class field
* Give api fill exports their own registerPlugin scope
* Refactoring WooProductFieldItem to generate unique IDs
* Adding components changelog
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