Support `annotation` API

[khieta]

Category

User level API changes

Describe the feature you'd like to request

The CedarJava package should support getting the annotation of a policy. The API is defined in the Rust cedar-policy package here.

Describe the solution you'd like

N/A

Describe alternatives you've considered

N/A

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

[muditchaudhary]

#296 adds annotation support for policies.