Add the ability to add namespace metadata, labels and annotations to k8s-tagger processor

[chaitanyaphalak]

Is your feature request related to a problem? Please describe.
We need a feature to add namespace-related metadata, labels, and annotations to our logs. The current feature set offered by the k8s-tagger processor only supports adding of pod-related metadata, labels, and annotations.

Describe the solution you'd like
It would be awesome if K8s tagger could add functionality to add namespace-related metadata, labels, and annotations to logs. The config that we think would work for this is as follows:

We have a PR with an implementation for the feature - #3384

Describe alternatives you've considered
No other alternatives are currently possible for doing this with the open telemetry collector(As far as we looked at the available options)
Additional context
We faced this issue while trying to use namespace labels and annotations with logs. The following issue shows how we tried to use it.
#3031

[chaitanyaphalak]

Closed as part of #3384