Setup CDK dependencies

Install the CDK modules that we will be using to build a pipeline.
Update sls-app\requirements.txt.

-e .
pytest

aws-cdk.aws_dynamodb
aws-cdk.aws-lambda
aws-cdk.aws_apigateway
aws-cdk.aws_codecommit
aws-cdk.aws_codedeploy
aws-cdk.aws_codebuild
aws-cdk.aws_codepipeline_actions

And run this command.

pip install --upgrade -r requirements.txt