Port to AWS Go SDK v2

[skitt]

1. Why is this pull request needed and what does it do?

v1 is deprecated, and support will end a little over a year from now. This ports the route53 plugin to v2.

The major difference is that listing resource records no longer uses a callback function; the results are retrieved directly, but paging has to be handled by the caller.

This hasn’t been tested on AWS yet.

2. Which issues (if any) are related?

None.

3. Which documentation changes (if any) need to be made?

None.

4. Does this introduce a backward incompatible change or deprecation?

None.

[codecov]

Codecov Report

Attention: Patch coverage is 55.81395% with 19 lines in your changes are missing coverage. Please review.

Project coverage is 59.19%. Comparing base (93c57b6) to head (12d7061).
Report is 1158 commits behind head on master.

Files	Patch %	Lines
plugin/route53/setup.go	36.84%	10 Missing and 2 partials ⚠️
plugin/route53/route53.go	70.83%	5 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6588      +/-   ##
==========================================
+ Coverage   55.70%   59.19%   +3.48%     
==========================================
  Files         224      252      +28     
  Lines       10016    13487    +3471     
==========================================
+ Hits         5579     7983    +2404     
- Misses       3978     4909     +931     
- Partials      459      595     +136     

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