This commit moves the configuration of a local Maven deployment
repository in a dedicated Gradle convention and applies it to all
sub-projects. This separates the publishing configuration for actual
project modules (that are meant to be published on Maven Central) from
the infrastructure sub-projects such as the documentation one.
This commit creates a new build convention that applies the Spring
JavaFormat Gradle plugin.
This is also adding a default checkstyle configuration for this project.
See gh-54
