feature: delete logs

[saikonen]

introduces logs scrub run_id/step/task_id command for scrubbing logs of tasks.

by default it deletes both stdout/stderr for the latest attempt of a task.

Final feature set:

• logs [pathspec] works as previously, with the new default subcommand custom click group
• logs show [pathspec] is the default subcommand for logs cmd group
• logs scrub [pathspec] will overwrite logs with a redacted message

also adds support for both show/scrub commands to specify --attempt [number] to target a specific attempt of a task, instead of the latest.

[savingoyal]

@saikonen we could introduce a top-level delete command that has a sub command - logs? wdyt? also, the default behavior could be for --latest-attempt and users can pass in --all-attempts to wipe out logs for all attempts?

[saikonen]

this now introduces logs as a command group, with a default fallback to the new logs show command in case no subcommmand is specified.

the following command still works the same

python LongLog.py logs 1713532810109387/start/1
python LongLog.py logs 1713532810109387/start/1 --stderr

but now we can also support the following

python LongLog.py logs delete 1713532810109387/start/1