Add indented Links Notation format support to lino-objects-codec

[konard]

Summary

The lino-objects-codec library should support an indented Links Notation format for output, in addition to the current parentheses-based format.

Requested Format

The library should support formatting objects in an indented style like:

6dcf4c1b-ff3f-482c-95ab-711ea7d1b019
  uuid "6dcf4c1b-ff3f-482c-95ab-711ea7d1b019"
  status "executed"
  command "echo test"
  exitCode "0"

Where the first line is the object identifier (UUID), and subsequent lines are indented properties in the format:

  <key> "<value>"

Current Format

Currently, the library only supports the parentheses-based format:

(type value)
(object (str key) (str value))

Use Case

This indented format is requested for displaying execution status in a more human-readable way while maintaining the Links Notation style.

Reference

Related to PR link-foundation/start#47 - Add --status --output-format support

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Filed from PR link-foundation/start#47 per user feedback.