Add a bundle summary command that includes URLs of everything that is deployed

[lennartkats-db]

Changes

Adds a textual output to the databricks bundle summary command, which
includes URLs of deployed resources.

Example usage:

$ databricks bundle summary
Name: my_pipeline
Target: dev
Workspace:
  Host: https://domain.databricks.com
  User: [email protected]
  Path: /Users/[email protected]/.bundle/my_pipeline/dev
Resources:
  Jobs:
    my_project_job:
      Name: [dev lennart] my_project_job
      URL:  https://domain.databricks.com/jobs/206899209187287?o=6051921418418893
  Pipelines:
    my_project_pipeline:
      Name: [dev lennart] my_project_pipeline
      URL:  https://domain.databricks.com/pipelines/3f849fd5-ba7d-47fa-a34c-c6bf034b4f58?o=6051921418418893

Notes:

• The top headers of the output are the same as those from the existing bundle summary command
• URLs are colored light blue in the output
• For resources that haven't been deployed yet, we show (not deployed) in place of the URL

[lennartkats-db]

Note that this property is populated and used for the JSON output of the summary command.