Merge pull request #19 from wso2/jdk-17

Add checkstyle files related to JDK 17 and new version.

Merge pull request #21 from VimukthiPerera/cloud

Replace import order rules with v2.17

Add seperation separation between import groups

Merge pull request #10 from Shan1024/master

Add support to checkstyle v8.18

Merge pull request #9 from hasithaa/master

Add UTF-8 as charset.

Add javadoc check first sentence

Release of Checkstyle configuration.