feat(iroh-cli): add file logging by default for start commands

[divagant-martian]

Description

Adds file logging by default to commands that start a node.

Parameters are:

• the "RUST_LOG" directive, in the form of and env var IROH_FILE_RUST_LOG or in the configuration file.
• rotation: how often a new file is created. Either daily, hourly or never.
• max files: Maximum number of files to keep

File logging can be disabled by either setting the max_files to 0 in the configuration file or by setting the rust log statement to off, in either the env var or the config file.

(example config file)

[file_logs]
rust_log = "iroh=trace"
rotation = "daily"
max_files = 1

The files created live the IROH_DATA_DIR/logs dir and are named iroh-2024-03-02.log (for a daily rotation, or with the hour, for an hourly rotation)

By default, we log everything in debug, rotating hourly, keeping at most 4 files (so total 4 hours of logs). This is short default since debug logs, even in an idle node, are a lot

Notes & open questions

n/a

Change checklist

• Self-review.
• Documentation updates if relevant.
• Tests if relevant.

[flub]

nice!