fix: refactor side loaded text tracks management (#4158)

* fix: refactor side loaded text tracks management

More textTracks in source.
android/ios: ensure text tracks are not selected by default
android/ios make textTrack field not nullable
clean up doc
check compatibility with the old api
Add comments on deprecated JS apis
Apply API change on basic sample

* chore: fix linter

* fix(ios): fix build with caching & remove warnings

ios/Video/DataStructures/SelectedTrackCriteria.swift

@@ -15,4 +15,8 @@ struct SelectedTrackCriteria {
         self.type = json["type"] as? String ?? ""
         self.value = json["value"] as? String
     }
+
+    static func none() -> SelectedTrackCriteria {
+        return SelectedTrackCriteria(["type": "none", "value": ""])
+    }
 }

ios/Video/DataStructures/VideoSource.swift

@@ -11,6 +11,7 @@ struct VideoSource {
     let customMetadata: CustomMetadata?
     /* DRM */
     let drm: DRMParams?
+    var textTracks: [TextTrack] = []
 
     let json: NSDictionary?
 
@@ -52,5 +53,8 @@ struct VideoSource {
         self.cropEnd = (json["cropEnd"] as? Float64).flatMap { Int64(round($0)) }
         self.customMetadata = CustomMetadata(json["metadata"] as? NSDictionary)
         self.drm = DRMParams(json["drm"] as? NSDictionary)
+        self.textTracks = (json["textTracks"] as? NSArray)?.map { trackDict in
+            return TextTrack(trackDict as? NSDictionary)
+        } ?? []
     }
 }