Use the SettingsService to resolve nested values in Structs

Use the SettingsService in the StructAdapter to resolve nested values in Structs. This doesn`t change the StructAdapters behaviour.

(CMS-17263)

Content object now contain the new property 'repositoryPath'

For certain customers it might be essential to retrieve folder information of content to be able to implement operational clients. The content-schema now contains the new property repositoryPath for all content object, for example, sites, channels, articles.

(CMS-17124)

Minor improvements on headless content schema

In order to sharpen the graphql responses, some properties are now defined as non-null, thus making null checks unnecessary on the client side.

(CMS-16896)

New Boolean flag "includeSubType" for search query

Starting with this release, the search query features a new boolean flag 'includeSubType'. Set to 'true', it indicates to also include the sub types of the given doc types (if any) in the search.

(CMS-16587)