Cockroach Community License (CCL) packages

Avoid adding new packages to this subdirectory

This tree previously housed our non-Apache2 licensed Go packages. Such packages were offered under the Cockroach Community License (ccl), hence the name. By convention, all packages under this tree have the suffix ccl.

All CockroachDB code is now offered under the CockroachDB Software License, making this division unnecessary. Packages are slowly being moved out of this subtree as time allows.