Config file driven multiple AWS Databricks workspaces deployment [Issue 187]

[hwang-db]

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Revamping this example of modular AWS DB workspace deployment - we can now define multiple environments with yaml files to deploy m workspaces into n VPCs and create multiple catalogs with isolated underlying infra. All the workspaces are using backend PL and CMK feature; the VPCs are configured with NAT for egress.