Revise InterfaceRegistry API to support filtering interfaces @ Bind() time.

services/service_manager/tests/connect/connect_test_class_app_manifest.json

 {
   "name": "service:connect_test_class_app",
   "display_name": "Connect Test Class App",
   "interface_provider_specs": {
     "service_manager:connector": {
       "provides": {
         "connect_unittests:class": [ "service_manager::test::mojom::ClassInterface" ],
         "connect_unittests:connect_test_service": [
           "service_manager::test::mojom::ConnectTestService"
         ]
-      },
-      "requires": {
-        "service:service_manager": [ "service_manager:explicit_class" ]
       }
     }
   }
 }