Improve CLI and project configs

[jenniferjiangkells]

Description

The current CLI is not used anywhere. Consider reassessing and designing a user-friendly CLI that allows users to easily create/init project templates, spin up sandboxes (abstract away running on another thread), download sample data.

Use yaml based configs?

# healthchain-config.yaml
integrations:
  ml_service:
    endpoint: ${ML_SERVICE_URL}
    input_format: json
    output_format: fhir

compliance:
  phi_detection: true
  data_governance: ["hipaa"]
  audit_level: detailed