[feature request]Bookmark and error response should be skipped in yurthub filter.

[rambohe-ch]

What would you like to be added:
A built-in filter framework is included in yurthub component, and the response from kube-apiserver can go through these filters.

And response for watch request has five types as following:

Added    EventType = "ADDED"
Modified EventType = "MODIFIED"
Deleted  EventType = "DELETED"
Bookmark EventType = "BOOKMARK"
Error    EventType = "ERROR"

then for Bookmak and Error response is not needed to go through filters. so we can add a if condition to verify that filter should be executed or not as following:

if watchType == watch. Added || watchType == watch.Modified || watchType == watch.Deleted {
	newObj := frc.objectFilter.Filter(obj, frc.stopCh)
	if yurtutil.IsNil(newObj) {
		continue
	}
}

openyurt/pkg/yurthub/filter/filter.go

Lines 241 to 244 in 74b0a47

	newObj := frc.objectFilter.Filter(obj, frc.stopCh)
	if yurtutil.IsNil(newObj) {
	continue
	}

others
/kind feature

[crazytaxii]

/assign