spec.yaml
* generators output spec.yaml files * source-singer generator also uses spec.yaml * update scaffold * update python cdk tutorials to use spec.yaml * add docs updates * consistency
* Refactor docs to improve clarity around connector development. * Merge architecture and setup of source acceptance tests to reference * Address reviewsa * Address review comments Co-authored-by: Abhi Vaidyanatha <abhivaidyanatha@Abhis-MacBook-Pro.local>