lambda promtail support EventBridge

[christrt9]

Is your feature request related to a problem? Please describe.
I try to send logs from ECS Events by Event Bridge rule to lambda-promtail and then to loki but i get this error message

level=error caller=main.go:207 err="error processing event: event bridge event type not supported"

Event bridge rule

{
  "source": ["aws.ecs"]
}

Describe the solution you'd like
to send logs from EventBridge to loki.

[cstyan]

PRs for supporting additional AWS products are welcome but internally we're not really using lambda-promtail extensively and it's maintenance is currently best effort.