support schema navigation

[vroldanbet]

As I analyze a complex schema, I navigate it using playground functions like go-to-definition when I highlight a part of a relation type or permission expression. This is useful for tracing the permission. The problem is the playground does not offer, like other IDEs like VSCode or JetBrains, a way to navigate back to the origin expression that took me to a different part of the schema via go-to-definition highlight. This slows me down severely and end up using browser search to navigate these large schemas.