#18215 Split up `process_execution` crate into a crate per runner Issue created by stuhood Currently, Pants' `process_execution` crate is a single crate containing ~8 distinct CommandRunner implementations. This would not be a problem if they were all quick to compile, but some of them have now gotten complex enough (with significant sets of external dependencies as well) that it would be worthwhile to split them into separate crates: • docker should go in one • remote and remote_cache have very similar dependencies, and should both go in a second crate • nailgun should go in a third pantsbuild/pants

#18215 Split up `process_execution` crate into a crate per runner Issue closed as completed by stuhood pantsbuild/pants