[experimental]: Create default toolbar nodes

[ahuseyn]

In order to provide a basic toolbar experience, we should create default toolbar nodes.

Acceptance Criteria

• Have "Edit current post/page link" node
• Have "Current post/page status and type" node
• Have "Shortcut to WP Admin" node
• Have "Authenticated user (viewer) profile basics (name, avatar, link)" node
• Nodes must be registered in the kitchen-sink example

Notes

• Existing toolbar can be used as a reference
• For "Edit current post/page link" consider multisite, CPT cases