improve aws-sdk import statement to reduce build size

[lepirlouit]

I suggest to replace the import statement in aws-lib import AWS from 'aws-sdk'; with import AWS from 'aws-sdk/global';

this will import aws config, etc without all the client services and apis.

This is enough to get the cognito credentials.

Size is reduced from 1.45mo to 145.69kb for aws-sdk.

source : https://github.com/aws/aws-sdk-js

[jayair]

@lepirlouit Hey yeah one of our other users found this and we added it to the tutorial - https://serverless-stack.com/chapters/deploy-to-s3.html#app-bundle-size

[lepirlouit]

Indeed. I didn't find this. Good Good.

[jayair]

@lepirlouit No worries. Thanks for pointing it out.