support tags for auto created log groups

[nwsparks]

Describe the question/issue

Please add support for tagging log groups to this plugin. I know the older version supports it but it would be nice to add the functionality to this one as well.

[PettitWesley]

This is a feature request for the CW C plugin: https://docs.fluentbit.io/manual/pipeline/outputs/cloudwatch

We have two plugins: https://github.com/aws/aws-for-fluent-bit/blob/mainline/troubleshooting/debugging.md#aws-go-plugins-vs-aws-core-c-plugins

The Go plugin has support for tagging new log groups: https://github.com/aws/amazon-cloudwatch-logs-for-fluent-bit