Add supports.typography.alignment argument so that blocks can use AlignmentControl automatically.

[jhned]

What problem does this address?

It's difficult to add the AlignmentControl component to a block. To filter it in on a block that doesn't support it, it's not a simple matter of filtering the block settings, but rather of filtering the whole edit function. That seems heavy-handed.

What is your proposed solution?

Add an argument under the supports.typography object that accepts "alignment." If present, AlignmentControl is automatically added to the Block Toolbar.