Support logs_body_key_attributes in OpenTelemetry output plugin

[LKummer]

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

The logs_body_key_attributes of the OpenTelemetry output plugin is not yet supported by the operator. It was added in fluent/fluent-bit@202da13.

I've been using the custom plugin option to enable it, and would like to have it supported by the output plugin CRDs.

apiVersion: fluentbit.fluent.io/v1alpha2
kind: ClusterOutput
# ...
spec:
  customPlugin:
    config: |
      name opentelemetry
      match kube.*
      host telemetry-exporter-components-collector
      port 4318
      logs_body_key_attributes true
  matchRegex: kube\.(.*)

Describe the solution you'd like

Add logsBodyKeyAttributes to OpenTelemetry output plugin schema.

I'd love to contribute the change, and will soon shoot a PR for it.

Additional context

No response