Parse cwl-tes logs in real-time

[uniqueg]

Is your feature request related to a problem? Please describe.
Currently logs (STDOUT/STDERR) of cwl-tes are parsed only after job completion, causing TES task IDs to be inaccessible until after a run completed. This has several severe disadvantages, such as:

• User are unable to track the progress of individual tasks; the task_log array field in the run_log object remains empty
• Ignorance of task IDs can lead to "zombie" runs that stay indefinitely in incomplete states, such as UNKNOWN or RUNNING
• Cancelling a workflow run cannot be propagated to the task level, leading to a waste of resources

Describe the solution you'd like
Parse cwl-tes run logs in real-time, publish task state changes to the broker and handle them in the event listener/manager.

Describe alternatives you've considered
Parsing logs and polling TES status changes (as done by cwl-tes) are temporary solutions only. See #57 and #58 for more viable solutions with regard to polling and log parsing, respectively.

Additional context
N/A

[uniqueg]

Closed by #67