Add serde feature to allow for serializing and deserializing different structs

[a0js]

Category

User level API features/changes

Describe the feature you'd like to request

I often find myself running from_str() on different structs like Entities, EntityTypeNames, and EntityUids. Often these are done from structured data. It would be really cool if there was a serde feature added to the cedar-policy crate that allowed for serialization and deserialization.

Example:

#[derive(Debug, Deserialize, Serialize)]
struct Message {
    entity_id: EntityId,
    entity_type: EntityTypeName,
    operation: Operation,
    timestamp: DateTime<Utc>,
    event_id: Uuid
}

Being able to deserialize the incoming message directly to an EntityId and EntityTypeName via the serde deserialize trait would be so nice.

Describe alternatives you've considered

At this point I just have to specify the entity_id and entity_type fields as Strings and perform the appropriate from_str() functions.

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

[shaobo-he-aws]

Thank you for your interest in Cedar. We're discussing the serialization format internally and will let you know the results.