Add cloudwatch service with support for batching metric data

[rowanseymour]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 77.27273% with 10 lines in your changes missing coverage. Please review.

Project coverage is 89.16%. Comparing base (2f44776) to head (9b3775c).

Files with missing lines	Patch %	Lines
aws/cwatch/service.go	69.69%	9 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #146      +/-   ##
==========================================
- Coverage   89.48%   89.16%   -0.32%     
==========================================
  Files          48       50       +2     
  Lines        2188     2216      +28     
==========================================
+ Hits         1958     1976      +18     
- Misses        177      186       +9     
- Partials       53       54       +1     

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