CodeStar Source for build pipeline generation (support for bitbucket source)

[robincsamuel]

#1038

Updated the cli method generate-pipeline to support codestar connection for bitbucket.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

Reference: https://docs.aws.amazon.com/codepipeline/latest/userguide/action-reference-CodestarConnectionSource.html

[robincsamuel]

@jamesls I've updated the typings, could you please run the workflow again?

[robincsamuel]

@jamesls gentle reminder :)

[charlesreid1]

bump