DSW-234: nested label - proof of concept

[jamieomaguire]

Example POC that uses a property to render a native html label inside the same shadow DOM as the textarea input. I believe this could be a better UX and provide a more native-like screen reader experience.

Also extracted the form-label styles into pie-css so other components could follow this pattern if we like it.

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[pie-design-system-bot]

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🚫	❌ PR Title Validation Failed The PR title should follow the same convention used for commits, e.g.: type(scope): TICKET-123 title where TICKET-123 is a valid ticket ID. Note: Ticket IDs cannot be all zeros (e.g. DSW-000 is not allowed). Current title: DSW-234: nested label - proof of concept

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