Add GN Build Files and Custom Modifications

Signed-off-by: peizhe <472708703@qq.com>

README.OpenSource

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+[
+  {
+    "Name": "foreign-types",
+    "License": "Apache License V2.0, MIT",
+    "License File": "LICENSE-APACHE, LICENSE-MIT",
+    "Version Number": "0.3.2",
+    "Owner": "xuelei3@huawei.com",
+    "Upstream URL": "https://github.com/sfackler/foreign-types",
+    "Description": "A framework for Rust wrappers over C APIs."
+  }
+]

foreign-types-shared/BUILD.gn

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+# Copyright (c) 2023 Huawei Device Co., 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.
+
+import("//build/ohos.gni")
+
+ohos_cargo_crate("lib") {
+  crate_name = "foreign_types_shared"
+  crate_type = "rlib"
+  crate_root = "src/lib.rs"
+
+  sources = [ "src/lib.rs" ]
+  edition = "2015"
+  cargo_pkg_version = "0.1.1"
+  cargo_pkg_authors = "Steven Fackler <sfackler@gmail.com>"
+  cargo_pkg_name = "foreign-types-shared"
+  cargo_pkg_description = "An internal crate used by foreign-types"
+}

foreign-types/BUILD.gn

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+# Copyright (c) 2023 Huawei Device Co., 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.
+
+import("//build/ohos.gni")
+
+ohos_cargo_crate("lib") {
+  crate_name = "foreign_types"
+  crate_type = "rlib"
+  crate_root = "src/lib.rs"
+
+  sources = [ "src/lib.rs" ]
+  edition = "2015"
+  cargo_pkg_version = "0.3.2"
+  cargo_pkg_authors = "Steven Fackler <sfackler@gmail.com>"
+  cargo_pkg_name = "foreign-types"
+  cargo_pkg_description = "A framework for Rust wrappers over C APIs"
+  deps = [ "//third_party/rust/crates/foreign-types/foreign-types-shared:lib" ]
+}