Issue #3247423: Added hook to prevent modification of the field path by the...

Frank Mablyrequested to merge
issue/domain_path-3247423:3247423-move-domain-path into 8.x-1.x

Issue #3247423: Added hook to prevent modification of the field path by the path and path auto modules, replaced original path field with field provided domain path, updated helper service, removed unused code, added validators to the new fields, added FieldItem, FieldItemList, and Widget for the domain path module.

Closes #3247423

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