Auth headers for loki output plugin

[Jonathan-Eid]

Is your feature request related to a problem? Please describe.

I cannot set custom headers authentication to authenticate into my remote loki instance.

Describe the solution you'd like

I want the chart to support the loki output options that's on the fluentbit official documentation: https://docs.fluentbit.io/manual/pipeline/outputs/loki

Specifically, the headers field and the bearer_token field should be settable in the helm chart. I authenticate to my loki using custom headers and now I have to find a workaround to set this option.

Additional context

No response