feat(policy object selectors): adds initial selector protos, moves po…

…licy object type messages to top-level to avoid circular imports, and provides subject mappings in response to GetAttributeValuesByFqns (#372)

* WIP

* move policy object types into top level proto file within policy to avoid circular import issues when adding selection potential to rebuild the tree when getting/listing

* remove unused import

* consume gencode from proto types being moved

* rebuild after removing extraneous proto imports

* spacing

* rename to objects.proto

* add value selector to get by fqns request

* add selector to fqns protos and clean up naming

* consume new types with the selector for the FQNs request and make it required in the proto

* checkpoint with FromSelect consuming the subjectMappings select builder and being overwritten

* make sure Value proto supports multiple subject mappings

* provide subject mappings back with the values in the get by fqns rpc

* remove unused import

* checkpoint: returning subject mappings and values only that match the FQN, not remaining values _without_ subject mappings, which is desired behavior

* improve tests

* supply subject mappings when getting values/attributes by fqn

* dedupe subject mappings

* remove TODO

docs/openapi/authorization/authorization.swagger.json

@@ -93,26 +93,14 @@
       ],
       "default": "DECISION_UNSPECIFIED"
     },
-    "authorizationAction": {
-      "type": "object",
-      "properties": {
-        "standard": {
-          "$ref": "#/definitions/ActionStandardAction"
-        },
-        "custom": {
-          "type": "string"
-        }
-      },
-      "title": "An action an entity can take"
-    },
     "authorizationDecisionRequest": {
       "type": "object",
       "properties": {
         "actions": {
           "type": "array",
           "items": {
             "type": "object",
-            "$ref": "#/definitions/authorizationAction"
+            "$ref": "#/definitions/policyAction"
           }
         },
         "entityChains": {
@@ -145,7 +133,7 @@
           "title": "ephemeral resource attributes id from the request"
         },
         "action": {
-          "$ref": "#/definitions/authorizationAction",
+          "$ref": "#/definitions/policyAction",
           "title": "Action of the decision response"
         },
         "decision": {
@@ -269,6 +257,18 @@
       },
       "title": "A logical bucket of attributes belonging to a \"Resource\""
     },
+    "policyAction": {
+      "type": "object",
+      "properties": {
+        "standard": {
+          "$ref": "#/definitions/ActionStandardAction"
+        },
+        "custom": {
+          "type": "string"
+        }
+      },
+      "title": "An action an entity can take"
+    },
     "protobufAny": {
       "type": "object",
       "properties": {