feat: adds direction property to design system #3535
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Description
This change adds a
direction
property to the design systems for FAST and MSFT to track the primary document direction. It also adds two behaviors to resolve CSS custom properties to direction-based values based on the design-systems direction. Ideally this wouldn't be necessary, but there are still significant gaps in browser support for https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_Logical_Properties.Related to #3246. This addresses most of the issues in that thread but does not add the behavior to conditionally apply
ComposableStyles
based on direction. That piece is not blocking so taking as a follow-up.Motivation & context
Issue type checklist
Is this a breaking change?
Adding or modifying component(s) in
@microsoft/fast-components
checklistProcess & policy checklist