[FEATURE] Add support for AWS Sigv4 request signer about opensearch-go

[VachaShah]

Also, I've created a PR for using AWS Sigv4 with AWS SDK V2 in case you are searching for that. Hopefully it gets approved, but until then you can just put the signer in your codebase.

#116

@matelang Thank you very much for adding this!

[VijayanB]

@VachaShah Aws sigv4 is already supported https://github.com/opensearch-project/opensearch-go/blob/main/signer/aws/aws.go. Do we need something more than this?

[matelang]

Also, I've created a PR for using AWS Sigv4 with AWS SDK V2 in case you are searching for that. Hopefully it gets approved, but until then you can just put the signer in your codebase.

#116

[VachaShah]

@VachaShah Aws sigv4 is already supported https://github.com/opensearch-project/opensearch-go/blob/main/signer/aws/aws.go. Do we need something more than this?

@VijayanB Thanks for pointing it out! I created this as part of a meta issue for clients. Will make sure to mark this as done.

[VachaShah]

Support for AWS Sigv4 is added.