Add support for the new schema syntax

[khieta]

Category

User level API changes

Describe the feature you'd like to request

Add support for new schema syntax introduced in Cedar v3.1. This is required to support the new integration tests in https://github.com/cedar-policy/cedar-integration-tests.

Describe alternatives you've considered

No response

Additional context

No response

Is this something that you'd be interested in working on?

• 👋 I may be able to implement this feature request
• ⚠️ This feature might incur a breaking change

[cdisselkoen]

The new schema syntax is supported in the FFI as of cedar-policy/cedar#793, so this should only need work here in this repo.