[ECS] [AWS CloudMap]: Increase number of records returned by Route53 for cloudmap entries

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**Tell us about your request**
When using Cloudmap the SRV and A records return only a maximum of 8 records at a time, for applications like HAproxy where you may want to get a list of all containers running application X so that you can load balance them, returning only 8 records means that the applications thrash their pools pulling servers in and out of rotation. Service discovery tools such as consul etc don't impose this limitation. And yes ALBs can be used but they definitely don't provide the same flexibility as HAproxy in this regard.

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

**Tell us about the problem you're trying to solve. What are you trying to do, and why is it hard?**
Return more than 8 records for SRV or A records when using cloudmap, ideally 100+
**Are you currently working around this issue?**
It's a current deal breaker for ECS service discovery..

Start with issue #1231 and its description of the Fargate and CloudMap service-discovery behavior. Confirm the current SRV and A record limit and determine whether the requested increase is possible within the affected AWS services. Done means CloudMap can return more than eight records, ideally 100 or more, without the reported pool thrashing.

Written by the indexing model from the issue text.