Improve log level user interface

[adzialocha]

# Set aquadoggo=INFO
LOG_LEVEL=info aquadoggo

# .. same, but via command line argument
aquadoggo --log-level info

# Set _all_ to INFO
aquadoggo --log-level "=info"

# ... etc.
aquadoggo --log-level "aquadoggo=INFO,libp2p=DEBUG"

# One can also set the value in config.toml (haven't included it in the template since using it there seems unlikely)

Closes: #537, #536, #534

📋 Checklist

• Add tests that cover your changes
• Add this PR to the Unreleased section in CHANGELOG.md
• Link this PR to any issues it closes
• New files contain a SPDX license header

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (bcf0fbb) 92.20% compared to head (49c4f3a) 92.20%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #539   +/-   ##
=======================================
  Coverage   92.20%   92.20%           
=======================================
  Files         102      102           
  Lines       16108    16108           
=======================================
+ Hits        14852    14853    +1     
+ Misses       1256     1255    -1     

see 4 files with indirect coverage changes

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[sandreae]

This is excellent!!