Apply Kubernetes filter on fluentbit internal logs input plugin

[tomerrt]

Is your feature request related to a problem? Please describe.
Can't see kubernetes metadata on fluentbit internal logs.

Describe the solution you'd like
Enable Kubernetes filter to work on fluent bit internal logs input. As fluentbit runs as daemonset in Kubernetes, it is useful to see its metadata.

Describe alternatives you've considered
none, either than not use the metadata.

Additional context
With many fluentbit instances in kubernetes cluster, it helps filtering logs per daemonset.