(wip) Extensions: organize blocks adding new categories

[retrofox]

Fixes #14598

Changes proposed in this Pull Request:

This PR reorganizes the block categories, adding/removing them.

Is this a new feature or does it add/remove features to an existing part of Jetpack?

Basically it changes the category for all blocks, but it doesn't affect the functionality of the blocks.

Testing instructions:

• Apply these changes
• Add/edit a post/page

You should be able to blocks organized by categories, according to the table described above.

[matticbot]

Caution: This PR has changes that must be merged to WordPress.com
Hello retrofox! These changes need to be synced to WordPress.com - If you 're an a11n, please commandeer, review, and approve D39044-code before merging this PR. Thank you!

[jetpackbot]

	Warnings
⚠️	pre-commit hook was skipped for one or more commits
⚠️	"Proposed changelog entry" is missing for this PR. Please include any meaningful changes

This is an automated check which relies on PULL_REQUEST_TEMPLATE. We encourage you to follow that template as it helps Jetpack maintainers do their job. If you think 'Testing instructions' or 'Proposed changelog entry' are not needed for your PR - please explain why you think so. Thanks for cooperation 🤖

Generated by 🚫 dangerJS against bd807f3

[matticbot]

retrofox, Your synced wpcom patch D39044-code has been updated.

[ockham]

Please consider registering a new Jetpack collection to hold these blocks -- see WordPress/gutenberg#17609 🙂

[retrofox]

Please consider registering a new Jetpack collection to hold these blocks -- see WordPress/gutenberg#17609 🙂

👍 Thanks for the advice and reference.

[simison]

Let's rather rebase and update #14454

[kraftbj]

Noting for the Jetpack collection, that is WordPress 5.4+, which is about to hit RC1. If we'll want to decide how we want to fallback for WP 5.3 (keep them all in a Jetpack category, use the new ones and lose the "Jetpack" category).