feat: hack for checklists

[devtooligan]

Adds isChecklist property on Rule which is set to true if rule.properties.checklist == "true".
Some display elements are conditionally changed if the result's rule is a checklist.

This change allows us to submit checklist catalog names as Rules in the run section and, checklist items as results below. This way we can maintain one static Sarif file as a repository for all checklist catalogs.

Here is an example Sarif for use with checklists and the new output.

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