Soopervisor

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* Support to pass extra cli args to ``ploomber task`` (via ``args`` in ``soopervisor.yaml``) when running in Argo and Airflow

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* Adds ``--root`` arg to ``soopervisor export-airflow`` to select an alternative project's root
* Determines default entry point using Ploomber's API to allow automated discovery of ``pipeline.yaml`` in package layouts (e.g. ``src/package/pipeline.yaml``)

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* Changes to the Airflow generated DAG
* Fixes a bug when initializing configuration from projects whose root is not the current directory

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* ``env.airflow.yaml`` optional when exporting to Airflow (17)
* Validating exported argo YAML spec
* Output argo YAML spec displays script in literal mode to make it readable
* Fixed extra whitespace in generated script
* Refactors ``ArgoMountedVolume`` to provide flexibility for different types of k8s volumes
* Adds section in the documentation to run examples using minikube
* Adds a few ``echo`` statements to generated script to provide better status feedback

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* Adds ability to skip dag loading during project validation
* Box uploader imported only if needed
* Exposes option to skip dag loading from the CLI

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* Adds Airflow DAG export
* Adds Argo/Kubernetes DAG export
* Support for uploading products to Box