Refactor Config::TypeInfo to cel::TypeRef in common/typedef.

Move `Config::TypeInfo` from `env/type_info` to `cel::TypeRef` in `common/typedef/type_ref` so that both environment configs and type definitions can share a common type reference representation. The class is being renamed because there is already an unrelated cel::TypeInfo class.

PiperOrigin-RevId: 991326545

Author: dmitriplotnikov

common/typedef/BUILD

@@ -0,0 +1,54 @@
+# Copyright 2026 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.
+
+load("@rules_cc//cc:cc_library.bzl", "cc_library")
+load("@rules_cc//cc:cc_test.bzl", "cc_test")
+
+package(default_visibility = ["//visibility:public"])
+
+licenses(["notice"])
+
+cc_library(
+    name = "type_ref",
+    srcs = ["type_ref.cc"],
+    hdrs = ["type_ref.h"],
+    deps = [
+        "//common:ast",
+        "//common:type",
+        "//common:type_kind",
+        "//internal:status_macros",
+        "@com_google_absl//absl/base:no_destructor",
+        "@com_google_absl//absl/container:flat_hash_map",
+        "@com_google_absl//absl/status",
+        "@com_google_absl//absl/status:statusor",
+        "@com_google_absl//absl/strings:string_view",
+        "@com_google_protobuf//:protobuf",
+    ],
+)
+
+cc_test(
+    name = "type_ref_test",
+    srcs = ["type_ref_test.cc"],
+    deps = [
+        ":type_ref",
+        "//common:type",
+        "//common:type_proto",
+        "//common/ast:metadata",
+        "//internal:proto_matchers",
+        "//internal:testing",
+        "//internal:testing_descriptor_pool",
+        "@com_google_absl//absl/status",
+        "@com_google_protobuf//:protobuf",
+    ],
+)