File messages on timeline (#311)

* Create media player screen

* Introduce `FileCache` to cache message attachments

* Add file loading functionality into the media provider

* Process tap action on timeline items

* Pass item taps to view model

* Navigate to media player on view model callback

* Commit project file

* Add changelog

* Add file messages into the timeline

* Create file preview screen

* Display files in the preview screen

* Commit project file

* Update Rust SDK to 1.0.19-alpha

* Add changelog

* Bump the RustSDK to `v1.0.20-alpha`

* Configure audio session on video playback

Co-authored-by: Stefan Ceriu <stefanc@matrix.org>

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

@@ -86,8 +86,8 @@
       "kind" : "remoteSourceControl",
       "location" : "https://github.com/matrix-org/matrix-rust-components-swift",
       "state" : {
-        "revision" : "c8494d858cfb60eb6167d76790b819c9dc15e822",
-        "version" : "1.0.18-alpha"
+        "revision" : "f4ff25f54c7e854fa1498f6dfd7bedca8c0ed260",
+        "version" : "1.0.20-alpha"
       }
     },
     {
@@ -129,7 +129,7 @@
     {
       "identity" : "swiftui-introspect",
       "kind" : "remoteSourceControl",
-      "location" : "https://github.com/siteline/SwiftUI-Introspect.git",
+      "location" : "https://github.com/siteline/SwiftUI-Introspect",
       "state" : {
         "revision" : "f2616860a41f9d9932da412a8978fec79c06fe24",
         "version" : "0.1.4"