[FARGATE] [request]: DNS configuration for containers

### Community Note

* Please vote on this issue by adding a 👍 [reaction](https://blog.github.com/2016-03-10-add-reactions-to-pull-requests-issues-and-comments/) to the original issue to help the community and maintainers prioritize this request
* Please do not leave "+1" or "me too" comments, they generate extra noise for issue followers and do not help prioritize the request
* If you are interested in working on this issue or have submitted a pull request, please leave a comment

**Tell us about your request**
As for now, you can not override container dns settings for ecs tasks using awsvpc network mode, so you stuck with default VPC resolver or DHCP options set.

**Which service(s) is this request for?**
Fargate

**Tell us about the problem you're trying to solve. What are you trying to do, and why is it hard?**
In some cases our fargate workloads can hit 1024 packets/sec limit for network interface in VPC Resolver which affects stability of our services. DNS customisation for containers will allow to use own caching DNS forwarder to a) prevent such limits to hit; b) control all outbound dns requests for out services which increases observability; c) connect internal dns for hybrid infrastructures.

**Are you currently working around this issue?**
Currently we found zero solutions to overcome this problem