* Foundation of the Products block replacement with Product Collection
* Provide logic to replace Products with Product Collection
* Make sure the blocks can be replaced
* Add types and refactor replacement a bit
* Fix the query attributes transform
* Add upgrade Notice to the Product Collection block
* Force upgrade notice to be displayed at the top of the Inspector Controls
* Externalise migration code so it can be reused in both ways
* Add util to get block IDs byt its name
* Add a way to revert the Product Collection blocks to Products
* Move the subscription to another place where it's triggered only once
* Add default values
* Remove attributes from Products block if they're not used to avoid incorrect query
* WIP logic of unseen/seen/reverted notice
* Change the state reading
* Revert changes regarding notice displaying logic
* Change the logc of firing replacement and bail early if there's no core/query blocks
* Add todos
* Implement inner blocks migration
* Implement the revert transformation of inner blocks
* Refactor types
* Add layout transformation from Products to Product Collection
* Add layout migration from Product Collection to Products
* Disable migration by default
* Simplify some parts of code
* Remove additional keyword from Product Collection to move it to another PR
* Adjust the logic to introduce the first step: conversion from Products to Product Collection
* Disable automatic migration
Karol Manijak