Structured logging and log levels

[tardieu]

We need to improve MCAD logging in particular switching to structured logging and revisiting log levels and log verbosity to facilitate log analysis.

[astefanutti]

Relates to project-codeflare/codeflare-operator#113.

/cc @KPostOffice

[eranra]

@tardieu Great :-) I think that this will be a perfect alignment with the metrics work that @dimakis started here: #486

@tardieu as part of the log levels setting, can you split between (a) operational logs (which are more important) and (b) debugging/developer logs (which are also very important) --- from what I saw when I scanned the code a lot of the logs are developer-centric and less "operations" centric.