pkg/errors dependency

pkg/errors is no longer maintained, cockroachdb/errors still depends on it, will that be an issue down the road.

looking for a pkg/errors replacement and just found this project, will start using it.

No files, tests, or entry points are named. Start by reviewing the repository's dependency declarations and locating its use of pkg/errors; determine whether cockroachdb/errors can replace it without breaking the public API, then define completion through passing the existing test suite and removing the dependency.

Written by the indexing model from the issue text.