Support region ap-east-1 on Amplify-cli ?

**Is your feature request related to a problem? Please describe.**
According to AWS Amplify document, the region ap-east-1 is available.
https://docs.aws.amazon.com/general/latest/gr/amplify.html

I found that the actual region ap-east-1 is still not available on Amplify-cli.
checked the source code as below:

[aws-regions.js](https://github.com/aws-amplify/amplify-cli/blob/27546a78159ea95c636dbbd094fe6a4f7fb8f8f4/packages/amplify-provider-awscloudformation/src/aws-regions.js)

[index.ts](https://github.com/aws-amplify/amplify-cli/blob/d52bc26d87c46cac5fa3d772bbb4e5528658bba2/packages/amplify-e2e-core/src/configure/index.ts)

In the meantime, I also found that the region related options with other services in other code [3]

[All region related code](https://github.com/aws-amplify/amplify-cli/search?q=us-east-1)

Would like to confirm if Amplify-cli can support region ap-east-1?

Thanks.

**Describe the solution you'd like**
Support region ap-east-1 on Amplify-cli.