Initial integration of RTE (#1464)

* Initial integration of RTE

* Fix `clipped`, `focused` and composer view type

* Remove horizontal padding

* Add `ComposerToolbar` mock

* Restore `composerFocusedSubject`

* Allow using HTML from RTE on message sent

* Fix new message content API

* Add feature flag for Rich Text Editor

ElementX.xcodeproj/project.xcworkspace/xcshareddata/swiftpm/Package.resolved

@@ -133,6 +133,15 @@
         "version" : "1.1.2"
       }
     },
+    {
+      "identity" : "matrix-wysiwyg-composer-swift",
+      "kind" : "remoteSourceControl",
+      "location" : "https://github.com/matrix-org/matrix-wysiwyg-composer-swift",
+      "state" : {
+        "revision" : "2827fea6508b62b8c458a29cb74282d99e63ecf7",
+        "version" : "2.6.3"
+      }
+    },
     {
       "identity" : "posthog-ios",
       "kind" : "remoteSourceControl",
@@ -235,7 +244,7 @@
     {
       "identity" : "swiftui-introspect",
       "kind" : "remoteSourceControl",
-      "location" : "https://github.com/siteline/SwiftUI-Introspect",
+      "location" : "https://github.com/siteline/SwiftUI-Introspect.git",
       "state" : {
         "revision" : "b94da693e57eaf79d16464b8b7c90d09cba4e290",
         "version" : "0.9.2"