Missing authenticationTypes OPENID_CONNECT and AWS_LAMBDA support

[mayunike]

I see currently authenticationType API_KEY only supported. Any plans to support other authentication types?

Thank you

[katesclau]

This depends on implementation on appsync-cli, more specifically, in the amplify-appsync-simulator package https://github.com/aws-amplify/amplify-cli

I've implemented a quick solution in our forked package (we also use a custom serverless-appsync-simulator forked from this one)
returnmates/amplify-appsync-simulator@7c8535d

I guess the proper way is to open an issue on amplify-cli, and follow up with a PR, but I've gone that path on another issue and their process is too slow for us...

Feel free to pick what you need from our repo 😉

[sambP]

duplicate #148 , right?