Added stateful version of isAuthorized and related methods. (#1829)

Signed-off-by: Marc Bridner <[email protected]>

Author: MarcBridner

cedar-policy/CHANGELOG.md

@@ -24,6 +24,7 @@ Starting with version 3.2.4, changes marked with a star (*) are _language breaki
 - Implemented variadic `ipaddr.isInRange` that returns true if the child `ipaddr` is in range for any of the arguments [RFC 99](github.com/cedar-policy/rfcs/pull/99)
 - Implemented batched evaluation under the experimental flag `tpe`. Batched evaluation allows for permission queries against large databases of entities. (#1812) 
 - Added `calculate_minimum_level` which computes the minimum level at which policies validate. (#1812)
+- Added `stateful_is_authorized`, `preparse_policy_set` and `preparse_schema` to support stateful evaluation using a cached policy set and schema, in the `ffi` module. (#1829)
 
 ### Changed