Blocks: Move applicable hooks from editor to blocks

[gziolo]

Description

This PR reverts some of the changes introduced when moving blocks components to editor module with #6521. It turns out, that some of the hooks are related to the Blocks API. I moved all those hooks back. The next step (follow-up PR) is going to be to rename all hooks that are left in the editor module.

How has this been tested?

Manually checked that there are no regressions introduced.

npm test still passes.

Types of changes

Refactoring. Moved some code between folders.

Checklist:

• My code is tested.
• My code follows the WordPress code style.
• My code has proper inline documentation.

[gziolo]

I discussed this proposal with @youknowriad and we agreed that we shouldn't move those hooks back as they fit better editor module. Instead, I will make sure that all tests inside blocks module don't depend on the registered core blocks. #6731 moves out all tests that need to depend on core block. I will open a follow-up which updates all others tests later this week.