[rng] Release 1.5 with Bill Of Materials (BOM)

[Alex Herbert]

I think RNG is ready for a release.

In 1.5 the multi-module project rearranges a few methods to default
interface methods in a different module. This is binary compatible. However
it requires that all versions of the modules are matched. If the other
modules are explicitly imported by a transitive dependency as a lower
version then this will cause a runtime error due to missing methods.

I suggest we create a Bill of Materials (BOM) as a separate artifact to be
deployed to maven for dependency management. Downstream users can then
include this in their POM and all versions of the RNG modules would be
matched.

<dependencyManagement>
    <dependencies>
        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-rng-bom</artifactId>
            <version>1.5</version>
            <type>pom</type>
            <scope>import</scope>
        </dependency>
    </dependencies>
</dependencyManagement>

Alex