Allow SOPS to use custom AWS KMS and STS Endpoint

[anandavj]

There's case when I have custom endpoint for my AWS service, with this changes I could specify STS and KMS endpoint for my AWS service Example usage:

creation_rules:
  - kms: "kms-arn"
    aws_profile: "default"
    aws_kms_endpoint: "https://kms.us-west-1.customawsendpoint.com"
    aws_sts_endpoint: "https://sts.us-west-1.customawsendpoint.com"

[anandavj]

Thanks for your contribution! I can't really comment on the AWS specific things, but as a general note, it looks like you should use gofmt to reformat the changes you made.

Thanks for the note, I've ran gofmt and it should be good now

[anandavj]

I apologize forgot to run the test after merging with main, I've fix the protobuf and finish test it in my local @felixfontein

[felixfontein]

You have quite a few commits in this PR that do not belong there. Could you please rebase your PR (instead of adding more merge commits) to get rid of the superfluous commits? Thanks.