Sketch in checklist entity type and a unit test

Closes #3474237

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• 1381fcca - Define the entity type and add assertions
• 2a9cb855 - Test that schema exists

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• c4a41c92 - Rename entity load hook collision

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• f864341b - Test that ID cannot be changed

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• 047eaee7 - Add the ability to query and add groups
• cd771cff - Ensure all exported properties are exported

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• e9b6c2af - Start converting the example checklist
• 8a38031f - Document interface

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• 2d7ac25c - Make test use example checklist

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• f338ad2f - Fix some test failures and coding standards violations

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• 71bdd410 - Fix some test failures and coding standards violations

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• 03b788ec - Fix some test failures and coding standards violations

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• 2627a61e - Fix some test failures and coding standards violations

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• c617bf23 - Fix some test failures and coding standards violations

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• 917661bb - Use string|Stringable

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• e3bfe2a8 - Add helper function to encode a Link object to an array

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• 26cb218d - Store weight in URL options
• 64f32184 - Move link export into its own class

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• 9e53d041 - Sketch in a Task object and config schema for it

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• bc956962 - Sketch in a Task object and config schema for it

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• fbb37adb - Sketch in a Task object and config schema for it

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• 8fa1b528 - Start transferring example checklist tasks into config
• 7032a20e - Rip out the example module, ship example checklist with the main module

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• a43a8f39 - Rip out the example module, ship example checklist with the main module

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• 103b225a - Fix some variadic stuff

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