feat: update generated css data to include more nesting solutions as well as new exports for property, syntax and types lists

[janechu]

Description

This change:

• Updates the syntax to be an object not an array (it would always resolve to a single array item)
• Adds syntax, types and properties lists as type references
• Updates nested groupings to be more precise and resolve more nesting situations (such as direct group nesting without any combinator splits)

Motivation & context

Further refines the data needed to complete #3773

Issue type checklist

• Chore: A change that does not impact distributed packages.
• Bug fix: A change that fixes an issue, link to the issue above.
• New feature: A change that adds functionality.

Is this a breaking change?

• This change causes current functionality to break.

Adding or modifying component(s) in @microsoft/fast-components checklist

• I have added a new component
• I have modified an existing component
• I have updated the definition file
• I have updated the configuration file

Process & policy checklist

• I have added tests for my changes.
• I have tested my changes.
• I have updated the project documentation to reflect my changes.
• I have read the CONTRIBUTING documentation and followed the standards for this project.