Tag cloud: add spacing block supports

[ramonjd]

Related:

• Tracking: Addressing Design Tooling Consistency #43241
• Tracking: Dimensions Design Tools Consistency #43243

What?

Enabling spacing support for the Tag cloud block

Why?

To create consistency across blocks.

How?

Adding the relevant block supports in block.json

Testing Instructions

1. Create a few posts, add a few tags.
2. Load the block editor and add a Tag cloud block.
3. Confirm that the dimensions control panel is there
4. Add margin and padding.
5. Save and confirm the styles appear on the frontend.
6. Test the new support works for the block via theme.json and global styles. See example JSON below.

	"styles": {
		"blocks": {
			"core/tag-cloud": {
				"spacing": {
					"padding": "122px",
					"margin": "22px"
				}
			}
		}
	}

[apeatling]

✅ Confirm that the dimensions control panel is there
✅ Add margin and padding.
✅ Save and confirm the styles appear on the frontend.
✅ Test the new support works for the block via theme.json and global styles. See example JSON below.