Formatting helpers (#15034)

* chore: add initial code formatting helper files

* chore: add license headers to code style files

* chore(codestyle): rm `spaces_around_brackets`

Author: matrei

.editorconfig

@@ -0,0 +1,26 @@
+#
+#  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
+#
+#    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.
+#
+root = true
+
+[*.{groovy,java}]
+indent_size = 4
+indent_style = space
+insert_final_newline = true
+spaces_around_operators = true
+wildcard_import_limit = 999

.gitignore

@@ -13,6 +13,9 @@
 .gradle/
 .idea
 .idea/
+!.idea/codeStyles/
+!.idea/codeStyles/Project.xml
+!.idea/codeStyles/codeStyleConfig.xml
 .project
 .settings
 /*/*.iml
@@ -55,4 +58,4 @@ tmp/
 !grails-fields/src/main/groovy/org/grails/scaffolding/registry/output
 !etc/bin
 etc/bin/results
-.vscode/
+.vscode/