[feature request] support structured logging

[furykerry]

What would you like to be added:
Follow the proposal of kubernetes, OpenKruise should use structured logging instead of unstructured logging and shall output json format if argument --logging-format=json is used.
https://kubernetes.io/blog/2020/09/04/kubernetes-1-19-introducing-structured-logs/

Pick a file or directory that you would like to improve and migrate existing log calls to use structured logs. It's a great and easy way to make your first contribution to Kruise!

Why is this needed:
OpenKruise currently use unstructured plain text as the logging format, which may logging processing hard.

• pkg/control
• pkg/controller
• pkg/daemon
• pkg/webhook
• pkg/util
• cmd

[MajLuu]

/assign
I will try to add structured logging in pkg/control dir, if i do it quickly, I will be pleasure to try other instances.

[manan1979]

is this issue open?

[furykerry]

yes，it is still open, other packages also need structured logging, i've updated the issue to list the packages need structured logging change

[jairuigou]

Hi, I want to try pkg/controller for my first commit to Kruise. Is anyone else working on this package?

[furykerry]

/assign @jairuigou