Add support for viewing and edit xcmappingmodel files (#3242)

Updates the handling of `.xcmappingmodel` files in the file and group
element creation logic, ensuring they are treated correctly as file
references rather than groups. It also adds a dedicated unit test to
verify this behavior.

Before implementation, only the .xml file was visible, inside a regular
folder. In addition to only being able to view the XML content and not
the Xcode preview,
<img width="310" alt="image (1)"
src="https://github.com/user-attachments/assets/5636e4b4-e835-4e5b-a2cb-11c53002eab6"
/>


Now there is interpretation via Xcode. 
<img width="310" alt="image"
src="https://github.com/user-attachments/assets/eb9f8abb-4689-45a6-b0e3-430ca64a36e7"
/>

In addition to displaying correctly in the file structure, when opened,
it shows the Xcode preview and not just the XML as before.

---------

Signed-off-by: Lucas Romano <[email protected]>

Author: lucasromanomr

CHANGELOG.md

@@ -49,6 +49,7 @@ END_UNRELEASED_TEMPLATE
 ### New
 
 * Added `--@rules_xcodeproj//xcodeproj:separate_index_build_output_base` flag to configure the generator to use a separate output base for index builds: [#3243](https://github.com/MobileNativeFoundation/rules_xcodeproj/pull/3243)
+* Add support for viewing and edit xcmappingmodel files: [#3242](https://github.com/MobileNativeFoundation/rules_xcodeproj/pull/3242)
 
 ### Adjusted
 

tools/generators/files_and_groups/src/ElementCreator/CreateGroupChild.swift

@@ -105,6 +105,19 @@ extension ElementCreator.CreateGroupChild {
                     )
                 )
 
+            case "xcmappingmodel":
+                return .elementAndChildren(
+                    createFile(
+                        name: name,
+                        bazelPath: BazelPath(
+                            parent: parentBazelPath,
+                            path: name
+                        ),
+                        bazelPathType: parentBazelPathType,
+                        transitiveBazelPaths: []
+                    )
+                )
+
             default:
                 return .elementAndChildren(
                     createGroup(

tools/generators/files_and_groups/test/ElementCreator/CreateFileElementTests.swift

@@ -497,4 +497,37 @@ final class CreateFileElementTests: XCTestCase {
         )
         XCTAssertEqual(result.resolvedRepository, stubbedResolvedRepository)
     }
+
+    func test_element_content_explicitFileType_xcmappingmodel() {
+        // Arrange
+
+        let name = "Mapping.xcmappingmodel"
+        let ext = "xcmappingmodel"
+        let bazelPath = BazelPath("a/bazel/path/Mapping.xcmappingmodel")
+        let createAttributes = ElementCreator.CreateAttributes.stub(
+            elementAttributes: ElementAttributes(
+                sourceTree: .group, name: nil, path: "a_path"
+            ),
+            resolvedRepository: nil
+        )
+
+        let expectedContent = #"""
+{isa = PBXFileReference; explicitFileType = wrapper.xcmappingmodel; path = a_path; sourceTree = "<group>"; }
+"""#
+
+        // Act
+
+        let result = ElementCreator.CreateFileElement.defaultCallable(
+            name: name,
+            ext: ext,
+            bazelPath: bazelPath,
+            bazelPathType: .workspace,
+            createAttributes: createAttributes,
+            createIdentifier: ElementCreator.Stubs.createIdentifier
+        )
+
+        // Assert
+
+        XCTAssertEqual(result.element.object.content, expectedContent)
+    }
 }