Toolbar: Make Faust Toolbar RSC ready

[theodesp]

Description

Faust Toolbar currently used in faust-core is not an RSC component. We need to review and provide an implementation part that can be used in Faust App router as an RSC Component.

Acceptance Criteria

• Toolbar main component is RSC ready.
• Check if Toolbar Items could work with Toolbar component. Some may not since they will require the Experimental App Router Client.

Technical Details

• Toolbar items could be either client or server components. The Toolbar Component itself should be RSC rendered.
• https://nextjs.org/docs/app/building-your-application/rendering/composition-patterns