[Master] Ignoring mass reformatting commits with git blame (#20578)

* Ignoring mass reformatting commits with git blame - initial commit

* Licence header

* A Commit sha to skip oneDNN files

.git-blame-ignore-revs

@@ -0,0 +1,22 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you 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.
+
+# Clang-formatter initial commit - /src directory is formatted
+e359bcd65e453d4bc86d3d8e5b1dee3916a2e426
+
+# Clang-formatter initial commit - OneDNN files
+718a860f3aa8f24acca2aec867a3b31bc60a6e79