Include the checkstyle plugin in LRA maven poms

To achieve a level of consistency of code it would be advantageous to include a formal set of checkstyle rules in this project.

Since a primary user of the LRA coordinator and LRA APIs are microprofile-lra and thorntail it makes sense to use the ruleset from one of those projects. For example, thorntail uses:

<!-- https://mvnrepository.com/artifact/org.wildfly.swarm/checkstyle-config -->
<dependency>
    <groupId>org.wildfly.swarm</groupId>
    <artifactId>checkstyle-config</artifactId>
    <version>1</version>
</dependency>