WIP: Add/social block movers

[draganescu]

Description

Depends on #16615

Implements movers for the Social Icons Block.

How has this been tested?

Enabled the option and tested locally

Screenshots

Types of changes

• The InnerBlocks component get a new set of options.
• Removed the mover hiding CSS

Checklist:

• My code is tested.
• My code follows the WordPress code style.
• My code follows the accessibility standards.
• My code has proper inline documentation.
• I've included developer documentation if appropriate.

[jorgefilipecosta]

The movers seem to work well. This PR applies with success the API being implemented in #16615, I left some comments on the API on the other PR.
For reference this is how the movers look on social links:

[jasmussen]

Ah, nice! Let's rebase when #16615 gets merged. Based on the GIF, this one is close, but needs a little love with regards to how the horizontal mover looks. Based on the GIF it looks like it's not quite as tall as it needs to be, which I fixed in 16615, and that it needs a little less space to the left. Both things I can fix easily, but I'd like to wait for the rebase to make sure I'm not duplicating work. Very cool.

[draganescu]

I am going to close this branch and do it again once the horizontal mover PR is in master.