[SM-919] Add project people access policy management endpoints (#3285)

* Expose access policy discriminators

* Add people policy model and auth handler

* Add unit tests for authz handler

* Add people policies support in repo

* Add new endpoints and request/response models

* Update tests

src/Core/SecretsManager/AuthorizationRequirements/ProjectPeopleAccessPoliciesOperationRequirement.cs

@@ -0,0 +1,12 @@
+using Microsoft.AspNetCore.Authorization.Infrastructure;
+
+namespace Bit.Core.SecretsManager.AuthorizationRequirements;
+
+public class ProjectPeopleAccessPoliciesOperationRequirement : OperationAuthorizationRequirement
+{
+}
+
+public static class ProjectPeopleAccessPoliciesOperations
+{
+    public static readonly ProjectPeopleAccessPoliciesOperationRequirement Replace = new() { Name = nameof(Replace) };
+}