* Support GET requests for aws-iam
This is required to support presigned requests from aws-sdk-go-v2
* Add GET method tests for aws-iam auth login path
* Update Website Documenation
* Validate GET action even if iam-server header is not set
* Combine URL checks
* Add const amzSignedHeaders to aws credential builtin
* Add test for multiple GET request actions
* Add Changelog Entry
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Co-authored-by: Max Coulombe <109547106+maxcoulombe@users.noreply.github.com>