FluentBit Sidecar Injection

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

Hello! I work for a really big Italian Company in the Energy sector and we are creating a log pipeline solution using FluentBit as a sidecar container sending record to FluentD deployment pods. We are onboarding hundreds of microservices, so there is a lot of repetitive work to do right now.

### Describe the solution you'd like

So, I'm wondering if a sidecar injector pattern ( the same you find in opentelemetry, envoy, ecc...) with a combination of pod metadata annotations and admission mutating webhook is something that are you considering to implement and if not why so?

### Additional context

I've tried to find related issues but I didn't find anything. Yet, I don't know the fluent operator project codebase, so maybe what I am asking is not feasibile in the first place, but since this is a real world scenario we are facing, maybe it could be in the community interest.

To conclude, I would be willing to contribute to implement this feature if you express interest in it.