Anchor function on inset-* and shorthands

[jamesnw]

Spec: https://drafts.csswg.org/css-anchor-position/#positioning

In addition to the top, left, bottom, and right physical properties, an anchor function can be added to:

• inset-block-start
• inset-block-end
• inset-inline-start
• inset-inline-end
• inset-block
• inset-inline
• inset shorthands

Related spec- https://drafts.csswg.org/css-logical-1/#position-properties