iOS Swift Conversion (#2527)

Converts iOS implementation from Objective-c to Swift

# During the conversion process some updates to the code structure were also made
- Modularize codebase from single file to smaller focused files
- Untangled large nested IF statements
- Added more null checks, since Swift is more strict with null pointers
- Added property to allow for decoding of local video sources with self contained key for offline playback
- Updates example apps to test react-native 0.63.4 and uses auto native dependency imports for android and ios

examples/basic/android/build.gradle

@@ -4,18 +4,15 @@ buildscript {
     ext {
         buildToolsVersion = "29.0.2"
         minSdkVersion = 16
-        compileSdkVersion = 31
+        compileSdkVersion = 29
         targetSdkVersion = 29
-        supportLibVersion = "28.0.0"
-
-}
+    }
     repositories {
-        jcenter()
         google()
+        jcenter()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:4.0.2'
-
+        classpath("com.android.tools.build:gradle:4.2.2")
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files
     }
@@ -24,18 +21,17 @@ buildscript {
 allprojects {
     repositories {
         mavenLocal()
-        google()
-        maven {
-           url "https://jitpack.io"
-        }
-        jcenter()
         maven {
             // All of React Native (JS, Obj-C sources, Android binaries) is installed from npm
-            url "$rootDir/../node_modules/react-native/android"
+            url("$rootDir/../node_modules/react-native/android")
         }
         maven {
             // Android JSC is installed from npm
             url("$rootDir/../node_modules/jsc-android/dist")
         }
+
+        google()
+        jcenter()
+        maven { url 'https://www.jitpack.io' }
     }
 }