Add base_config and partial_config files under restricted_destination testdata (#1106)

* Expose public methods to convert function and variable decl to v1 Decl

* Break up restricted destinations test config file into base_config and partial_config files to be used for test runner

Author: aakash070

policy/testdata/restricted_destinations/base_config.yaml

@@ -0,0 +1,45 @@
+# Copyright 2024 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+name: "labels"
+extensions:
+- name: "lists"
+- name: "sets"
+variables:
+- name: "destination.ip"
+  type:
+    type_name: "string"
+- name: "origin.ip"
+  type:
+    type_name: "string"
+- name: "spec.restricted_destinations"
+  type:
+    type_name: "list"
+    params:
+    - type_name: "string"
+- name: "spec.origin"
+  type:
+    type_name: "string"
+- name: "request"
+  type:
+    type_name: "map"
+    params:
+    - type_name: "string"
+    - type_name: "dyn"
+- name: "resource"
+  type:
+    type_name: "map"
+    params:
+    - type_name: "string"
+    - type_name: "dyn"

policy/testdata/restricted_destinations/partial_config.yaml

@@ -0,0 +1,23 @@
+# Copyright 2024 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+name: "labels"
+functions:
+- name: "locationCode"
+  overloads:
+  - id: "locationCode_string"
+    args:
+    - type_name: "string"
+    return:
+      type_name: "string"