feat: add s3 batch result code constants

[moofish32]

This adds constants and a type for S3 Batch Result Codes similar to what
is available for CodeBuild results

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.46%. Comparing base (26aa364) to head (9e771cc).
Report is 150 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #302      +/-   ##
==========================================
- Coverage   74.60%   72.46%   -2.15%     
==========================================
  Files          13       18       +5     
  Lines         638      730      +92     
==========================================
+ Hits          476      529      +53     
- Misses        123      136      +13     
- Partials       39       65      +26     

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[bmoffatt]

I think adding the type creates a breaking change. Assignment to a string will require a type cast

ex: https://play.golang.org/p/T5G1eKtbBor

I think leaving the type as string is fine

[bmoffatt]

downside of changing S3BatchJobResult.ResultCode type back to string, is that comparisons against this new type require a cast!

if inputEvent.Results[0].ResultCode == S3BatchJobResultCodeSucceeded {
  // ..
}

->

Invalid operation: inputEvent.Results[0].ResultCode == S3BatchJobResultCodeSucceeded (mismatched types string and S3BatchJobResultCode)

Instead, go back to having S3BatchJobResult being a S3BatchJobResultCode. It is useful for self documentation purposes. But also change the type to be a type alias eg: type S3BatchJobResultCoce = string - this will preserve backwards compatibility.