(chore)(sytle) Apply Python styling by black via spotless maven plugin (#113)

* introduce spotless maven plugin with Python black for styling

dev/reformat

@@ -0,0 +1,32 @@
+#!/bin/bash
+#
+# 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.
+#
+
+set -x
+
+
+PROFILES="-P "
+
+# python style checks rely on `black` in path
+if ! command -v black &> /dev/null
+then
+    echo "Skip Python lint since 'black' is not available. Please install 'black' by running 'pip install black==22.3.0'"
+else
+    PROFILES="${PROFILES} spotless-python"
+fi
+
+mvn spotless:apply $PROFILES