feat: Improve editor session events (#23955)

* feat: Introduce `gutenberg_kit` editor session event property value

Denote sessions utilizing the GutenbergKit editor.

* feat: Track editor session start event

Enable more robust editor session analysis.

* build: Update GutenbergKit ref

* build: Update GutenbergKit ref

Author: dcalhoun

Modules/Package.swift

@@ -48,7 +48,7 @@ let package = Package(
         .package(url: "https://github.com/zendesk/support_sdk_ios", from: "8.0.3"),
         // We can't use wordpress-rs branches nor commits here. Only tags work.
         .package(url: "https://github.com/Automattic/wordpress-rs", revision: "alpha-20241116"),
-        .package(url: "https://github.com/wordpress-mobile/GutenbergKit", revision: "v0.0.3"),
+        .package(url: "https://github.com/wordpress-mobile/GutenbergKit", revision: "4476d597b271778d001a26c50d74e527b54ebfef"),
         .package(url: "https://github.com/Automattic/color-studio", branch: "trunk"),
     ],
     targets: XcodeSupport.targets + [

WordPress.xcworkspace/xcshareddata/swiftpm/Package.resolved

@@ -127,7 +127,7 @@ class NewGutenbergViewController: UIViewController, PostEditor, PublishingEditor
         self.post = post
 
         self.replaceEditor = replaceEditor
-        self.editorSession = PostEditorAnalyticsSession(editor: .gutenberg, post: post)
+        self.editorSession = PostEditorAnalyticsSession(editor: .gutenbergKit, post: post)
         self.navigationBarManager = navigationBarManager ?? PostEditorNavigationBarManager()
 
         let networkClient = NewGutenbergNetworkClient(blog: post.blog)
@@ -315,6 +315,16 @@ class NewGutenbergViewController: UIViewController, PostEditor, PublishingEditor
 }
 
 extension NewGutenbergViewController: GutenbergKit.EditorViewControllerDelegate {
+    func editorDidLoad(_ viewContoller: GutenbergKit.EditorViewController) {
+        if !editorSession.started {
+            // Note that this method is also used to track startup performance
+            // It assumes this is being called when the editor has finished loading
+            // If you need to refactor this, please ensure that the startup_time_ms property
+            // is still reflecting the actual startup time of the editor
+            editorSession.start()
+        }
+    }
+
     func editor(_ viewContoller: GutenbergKit.EditorViewController, didDisplayInitialContent content: String) {
         // Do nothing
     }

WordPress/Classes/ViewRelated/NewGutenberg/NewGutenbergViewController.swift

@@ -97,6 +97,7 @@ private extension PostEditorAnalyticsSession {
 extension PostEditorAnalyticsSession {
     enum Editor: String {
         case gutenberg
+        case gutenbergKit = "gutenberg_kit"
         case classic
         case html
     }