Features
* Add EMRStep support in Sagemaker pipeline
* Adds Lineage queries in artifact, context and trial components
* Add support for SageMaker lineage queries in action
* Adds support for Serverless inference
* support checkpoint to be passed from estimator
* support JsonGet/Join parameterization in tuning step Hyperparameters
* Support model pipelines in CreateModelStep
* enable python 3.9
* Add models_v2 under lineage context
Bug Fixes and Other Changes
* allow kms_key to be passed for processing step
* Remove duplicate vertex/edge in query lineage
* update pricing link
* Update CHANGELOG.md
* fixes unnecessary session call while generating pipeline definition for lambda step
Documentation Changes
* Enhance smddp 1.2.2 doc
* Document the available ExecutionVariables