add caliper packages and GrandTourIT to core

[adamcin]

I happen to know that subPackageHandling is not fully respected by OakMachine in terms of defining installation order of subpackages, and I wanted to have this kind of happy path test package available before I implemented the sorting. The other justifications for including this content package graph as first-order maven modules instead of just prebuilding a zip or nesting directories of flat files like other test packages include:

• better tracking of the evolution of the filevault-package-maven-plugin and the resulting artifacts
• more obvious relationship at a glance between AEM maven project conventions and progress check logic
• publishing a valid, complex content package artifact to maven central will make it available for use as a test artifact in other contexts downstream

[adamcin]

@justinedelson please take a look at this