Add standard community files (CONTRIBUTING, CODE_OF_CONDUCT, SECURITY, CODE_STYLE, CHANGELOG), checkstyle config with Apache-2.0 headers, GitHub release config, integration tests, and bind checkstyle to the validate phase.
Add standard community files (CONTRIBUTING, CODE_OF_CONDUCT, SECURITY, CODE_STYLE, CHANGELOG), checkstyle config with Apache-2.0 headers, GitHub release config, integration tests, and bind checkstyle to the validate phase.