[AC-1287] AC Team code ownership moves: Policies (1/2) (#3383)

* note: IPolicyData and EntityFramework Policy.cs are moved without any
  changes to namespace or content in order to preserve git history.

src/Identity/IdentityServer/CustomTokenRequestValidator.cs

@@ -1,4 +1,5 @@
 using System.Security.Claims;
+using Bit.Core.AdminConsole.Services;
 using Bit.Core.Auth.Identity;
 using Bit.Core.Auth.Models.Api.Response;
 using Bit.Core.Auth.Models.Business.Tokenables;