add model-mapper plugin & optimize model-router plugin (#1538)

plugins/wasm-cpp/extensions/model_mapper/BUILD

@@ -0,0 +1,70 @@
+# Copyright (c) 2022 Alibaba Group Holding Ltd.
+#
+# 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
+#
+#      http://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("@proxy_wasm_cpp_sdk//bazel:defs.bzl", "proxy_wasm_cc_binary")
+load("//bazel:wasm.bzl", "declare_wasm_image_targets")
+
+proxy_wasm_cc_binary(
+    name = "model_mapper.wasm",
+    srcs = [
+        "plugin.cc",
+        "plugin.h",
+    ],
+    deps = [
+        "@proxy_wasm_cpp_sdk//:proxy_wasm_intrinsics_higress",
+        "@com_google_absl//absl/strings",
+        "@com_google_absl//absl/time",
+        "//common:json_util",
+        "//common:http_util",
+        "//common:rule_util",
+    ],
+)
+
+cc_library(
+    name = "model_mapper_lib",
+    srcs = [
+        "plugin.cc",
+    ],
+    hdrs = [
+        "plugin.h",
+    ],
+    copts = ["-DNULL_PLUGIN"],
+    deps = [
+        "@com_google_absl//absl/strings",
+        "@com_google_absl//absl/time",
+        "//common:json_util",
+        "@proxy_wasm_cpp_host//:lib",
+        "//common:http_util_nullvm",
+        "//common:rule_util_nullvm",
+    ],
+)
+
+cc_test(
+    name = "model_mapper_test",
+    srcs = [
+        "plugin_test.cc",
+    ],
+    copts = ["-DNULL_PLUGIN"],
+    deps = [
+        ":model_mapper_lib",
+        "@com_google_googletest//:gtest",
+        "@com_google_googletest//:gtest_main",
+        "@proxy_wasm_cpp_host//:lib",
+    ],
+)
+
+declare_wasm_image_targets(
+    name = "model_mapper",
+    wasm_file = ":model_mapper.wasm",
+)