Feature request: Native support for AWS CodeCommit repositories

[Yethal]

It would be really handy if go-getter was able to clone AWS CodeCommit repositories using instance profile for authorization. Currently accessing CodeCommit is possible but requires additional steps:

1. awscli needs to be installed on the machine
2. git-remote-codecommit needs to be installed on the machine
3. System git config needs to include codecommit specific configuration:
   git config --global credential.helper '!aws codecommit credential-helper $@'
git config --global credential.UseHttpPath true

Having native support would allow users to access CodeCommit without installing awscli (or Python in general)