Allow logging to be configured by file

[d80tb7]

This allows logging to be configured by a logging configuration file- which offers the following features:

• Ability to set log level
• Ability to set log format (json, text or colourful)
• For file logging the ability to set log rotation settings
• Ability to set all the above settings spearately for consolve logging vs file logging and have both apply simultaneously.

A default file is included int he docker image, but users may provide their own by setting the ARMADA_LOG_CONFIG env var with a path to their configuration file.