engine: log versions

[josephjclark]

The CLI log versions of key components at the start of a run (cli/runtime/compiler/node/adaptor)

The engine needs to do the same thing. We may be able to steal some code.

Note that this is done at the start of a job, not an attempt. We may need a callback in the runtime for that (unless we cheat a bit).

Maybe the attempt can also log some versions - worker, node, engine. Then the job would log node, runtime, adaptor.

Compiler version right now will be in the attempt, but we can move it to the run when we sort out #392.

[josephjclark]

Kinda forgot this in planning. It's not needed for rc2, but it's nice to have for the first launch.