Google Stackdriver output

[seanson]

Is your feature request related to a problem? Please describe.
We use stackdriver as an output for fluentd for a manual deploy currently but would like to move to logging-operator.

Describe the solution you'd like
I'd like to use the fluent-plugin-google-cloud in the same manner as the other backend based plugins like ElasticSearch.

Describe alternatives you've considered
I have considered a GCS logging bucket and a function to ship the logs from there into the StackDriver API but it is a less than ideal option.

Additional context
This was previously raised in #40 but considered not required unless someone was willing to raise it as a separate request later.

[KrustyHack]

Ay,

Is StackDriver output available ? We want to move from our old logging workflow to Banzai Cloud Logging Operator but StackDriver is mandatory for us.