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Provide metrics for current executor stage
We currently provide metrics about job's state (pending, running, finished etc.) and job's stage (prepare_script, get_sources, build_script etc.).
We should prepare a similar metrics that will show what is happening inside of the executor. First idea is to add a general mechanism to executors/executor_abstract.go, and extend it - if needed - inside of each executors (especially with executor specific state names).