* Introduce content index handlers for the Delivery API
* Do not add protected content to the index
* Re-introduce public collection builder extensions
* Add backwards compatible constructor to ConfigureIndexOptions
* Fix edge case for published children of unpublished parents
* Reduce number of hardcoded field names
* Fixed copy/paste comment
* Fix field definition type for date
* Do not add trashed items to the content index
* Don't expose protected content through the item endpoints
* Removing ReSharper comment
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Co-authored-by: Elitsa <elm@umbraco.dk>
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