chore: fix log format

[JasonVranek]

Adds more flexibility when logging to support writing to both stdout and a file or either. Also the user can choose whether they want the current default formatting, a raw formatting, or JSON formatting according to the requested formats from #225.

Two new fields to the config:

# Log format. Supported values: default, json, raw
# OPTIONAL, DEFAULT: default
format = "raw"
# Log destination. Supported values: stdout, file, both
# OPTIONAL, DEFAULT: stdout
destination = "both"

closes #225

[ltitanb]

Looks good! Could you please fix lint and post some screenshots of how the logs look like with the new config?

[JasonVranek]

JSON format, writing both to stdout + file

RAW format, writing both to stdout + file

DEFAULT format, writing only to stdout

note the other permutations work but aren't pictured:

• JSON + stdout only
• JSON + file only
• RAW + stdout only
• RAW + file only
• DEFAULT + file only
• DEFAULT + both

[ltitanb]

refactored in #281