Logging al RESTCONF requests and responses

There should be an option to log whole RESTCONF traffic - requests and responses - without external dependency.

Customer-based requirements about the contents of logs (user ID is probably one of the most important fields - native Jetty logger/LoggingFeature from Jersey will not help much):

• timestamp (human-readable format & unix format - milliseconds)
• log level
• logging filter name
• remote address
• controller user ID (resolved using AAA)
• request method
• request URI
• request body size
• response code
• response payload size
• duration in milliseconds
• request/response body
• http headers
• query parameters

Next requirements:

• option to enable/disable logging at runtime + providing a configuration using cfg file in etc
• option to configure whether HTTP headers, query parameters, and bodies should be part of output logs
• option to hide selected headers - Authorization/Cookie
• option to redirect logs to separate file - logs should be generated from separate classes, so it will be possible to easily configure log4j2 appender
• simple column-based format (using ' | ' for separation of fields)

Requests and responses can be logged separately.

Note: we can inspire by LoggingFeature or LoggingFilter (jersey).