Dynamic Root (Alternative to XPath in MNTP) (#15035)

* Temp commit.. Initial work on XPath alternative for dymamically finding start nodes

* First commit that goes all the way from ui to db for NearestAncestorOrSelf

* Added more filters + return null from controller instead of not found

* Bugfix

* rewrite query to make sqlserver happy?

* Added more tests

* clean up initial step

* Added tests and refactor

* Update endpoint to take model instead of json

* pick origin

* Use model for config instead of string

* append add filter button

* fix

* default filter

* rename json fields

* correct field names

* minor corrections

* Renaming..

* Rename endpoint

* initial work for appending query steps

* query steps ui

* more localization

* query step UI

* Use doc type keys instead of alias

* only for Documents

* change to send keys to anyOfDocTypeKeys

* Fix potential bug

* Fix when level is impossible to get

* correct prop to dynamicRoot

* noValidStartNode dialog

* custom query step

* Renaming

* Rollback unintended file change

* Fixed issue if no doc type is chosen

* Remove unintended file changes

* More unintended changes

* Renaming

* Optimizations

- IDE Recommendation for better source
- Renaming for better clarity
- Improving spacing/formatting
- Typo corrections
- Remove warnings concerning IEnumerable

* Fix failed attempt bug

---------

Co-authored-by: Niels Lyngsø <niels.lyngso@gmail.com>
Co-authored-by: Sven Geusens <sge@umbraco.dk>

src/Umbraco.Core/PropertyEditors/MultiNodePickerConfigurationTreeSource.cs

@@ -14,6 +14,33 @@ public class MultiNodePickerConfigurationTreeSource
     [DataMember(Name = "query")]
     public string? StartNodeQuery { get; set; }
 
+    [DataMember(Name = "dynamicRoot")]
+    public DynamicRoot? DynamicRoot { get; set; }
+
     [DataMember(Name = "id")]
     public Udi? StartNodeId { get; set; }
 }
+
+[DataContract]
+public class DynamicRoot
+{
+    [DataMember(Name = "originAlias")]
+    public string OriginAlias { get; set; } = string.Empty;
+
+    [DataMember(Name = "originKey")]
+    public Guid? OriginKey { get; set; }
+
+    [DataMember(Name = "querySteps")]
+    public QueryStep[] QuerySteps { get; set; } = Array.Empty<QueryStep>();
+}
+
+[DataContract]
+public class QueryStep
+{
+    [DataMember(Name = "alias")]
+    public string Alias { get; set; } = string.Empty;
+
+    [DataMember(Name = "anyOfDocTypeKeys")]
+    public IEnumerable<Guid> AnyOfDocTypeKeys { get; set; } = Array.Empty<Guid>();
+}
+