GESTALT-7528: Spacing Token Matching

[protodave]

Summary

Adds support for matching and linting spacing variables

Development Notes

Spacing variable usage is only applicable for FRAME (and INSTANCE?) nodes with layoutMode = HORIZONTAL | VERTICAL (not NONE).

Spacing variables have the GAP scope.

Object parameters that can use spacing variables, and also the boundVariables property name:

• itemSpacing - For auto-layout frames with layoutMode set to HORIZONTAL, this is the horizontal gap between children. For auto-layout frames with layoutMode set to VERTICAL, this is the vertical gap between children.
• counterAxisSpacing - Applicable only on auto-layout frames with layoutWrap set to WRAP. Determines the distance between wrapped tracks.
• paddingBottom
• paddingLeft
• paddingRight
• paddingTop
• horizontalPadding - DEPRECATED: Use paddingLeft and paddingRight instead.
• verticalPadding - DEPRECATED: Use paddingTop and paddingBottom instead.

Note: The Plugin API also includes a inferredAutoLayout property, which has all those except counterAxisSpacing for some reason.