Create a new pipeline based on events when a new branch is created

[s1mrankaur]

Referring to https://aws.amazon.com/blogs/devops/multi-branch-codepipeline-strategy-with-event-driven-architecture/, It shows the approach we discussed in another issue to trigger a pipeline for every new branch based on events/lambda functions.

It should be useful to have a pipeline automatically created for new branches and automatically deleted after.