Add subteam metapackages

[matthew-reynolds]

Pull Request

Adds a meta-package for each subteam's packages.

Note that, as per our discussion, top-level "aggregate" launch files will all live in uwreact_bringup, rather than creating submetapackage-specific launch file packages. This means, for now, we should expect approximately 4 launch files in the top-level uwreact_bringup: bringup.launch, controls.launch, perception.launch, planning.launch. Each individual package may have its own launch files, but there should not be submetapackage launch file packages.

Contribution Checklist

• [x] I have read the contributing guide.
• [ ] I have referenced relevant issues.
• [x] I have labeled accordingly.
• [x] I have detailed my changes as much as possible.

Change Checklist

• [ ] I have added tests.
• [x] I have added necessary documentation.
• [x] I have auto formatted using clang-format or yapf.
• [ ] I have tested my changes on real hardware.