Added a progress tracker to the bug report view (#513)

* created a progress tracker class and passed it in the user notification to be observed by the progress view

* improved the publishing by dispatching it on RunLoop.main

* bug report struct created and progress tracker class moved into the Other folder

* some swiftlint adjustments

* fixed tests

* fixed another test BugReportServiceTests

* changelog 495 - change

* added a mock preview

* fixing some linting suggestions

* no need to use KVO, achieve the same result using a publisher

* some refactors to address PR comments

* some code improvements

* fixed the issue that prevented the avatar of the room to be displayed in the mocks, and updated the tests

* Revert "fixed the issue that prevented the avatar of the room to be displayed in the mocks, and updated the tests"

This reverts commit 113d6091d91a3aac1f9a59ff6c5e07610ed59859.

ElementX/Sources/Screens/BugReport/BugReportModels.swift

@@ -19,7 +19,7 @@ import UIKit
 
 enum BugReportViewModelAction {
     case cancel
-    case submitStarted
+    case submitStarted(progressTracker: ProgressTracker)
     case submitFinished
     case submitFailed(error: Error)
 }