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**What type of PR is this?** Feature **What does this PR do? Why is it needed?** This PR introduces an ephemeral log file that captures debug logs for 24 hours. - it captures debug logs regardless of the user provided (or non-provided) `--verbosity` flag. - it allows a maximum of 250MB for each log file. - it keeps 1 backup logfile in case of size-based rotations. (as opposed to time-based) - this is enabled by default for beacon and validator nodes. - the log files live in `datadir/logs/` directory under the names of `beacon-chain.log` and `validator.log`. backups have a timestamp in their name as well. - the feature can be disabled using the `--disable-ephemeral-log-file` flag.