Managed log source for AWS LB logs

[timoguin]

Add support for managing AWS load balancer logs.

Tasks

• [x] Classic Load Balancer logs
• [x] Application Load Balancer logs
• [x] Network Load Balancer logs

References

• Classic ELB logs: https://docs.amazonaws.cn/en_us/elasticloadbalancing/latest/classic/access-log-collection.html
• ALB logs: https://docs.aws.amazon.com/elasticloadbalancing/latest/application/load-balancer-access-logs.html
• NLB logs: https://docs.aws.amazon.com/elasticloadbalancing/latest/network/load-balancer-access-logs.html

[timoguin]

@Samrose-Ahmed Do you know if the schemas and transforms you added support all 3 load balancer types, or is it just Application Load Balancers?

[Samrose-Ahmed]

They support all three, should make that clearer in the docs.