Provide 'swift' logging API #2
Description
A policy author should be able to generate logs from within a policy.
These log messages are going to be picked by the waPC host, which will process them according to its configuration.
This is part of kubewarden/policy-server#73
Acceptance criteria
- User can use simple string messages
- User can do structured logging if wanted: simple string message + dictionary with key/values
- The following log levels are available: debug, info, warning, error