* Switch to aws-sdk-go-v2
AWS has released v2 of their SDK for Go.
See: https://aws.github.io/aws-sdk-go-v2/
One big advantage of this is no longer needing to export the
`AWS_SDK_LOAD_CONFIG=1` env var when using named profiles.
* Update integration test README
* Reenable pager601 and pager1201 integration tests for AWS Route53
* Implement intelligent batching for Route53 record changes
The AWS Route53 API for batch record changes limits the request size to
the smaller of:
- 1000 records.
- 32000 characters total for record values.
Also UPSERTs count as double (a DELETE and then a CREATE).
This commit changes how the record ChangeBatches are created to
respect these limits.
* Remove old comments
Co-authored-by: Tom Limoncelli <tlimoncelli@stackoverflow.com>
