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

ios/Video/RCTSwiftLog/RCTSwiftLog.m

@@ -0,0 +1,32 @@
+#import <React/RCTLog.h>
+
+#import "RCTSwiftLog.h"
+
+@implementation RCTSwiftLog
+
++ (void)info:(NSString *)message file:(NSString *)file line:(NSUInteger)line
+{
+    _RCTLogNativeInternal(RCTLogLevelInfo, file.UTF8String, (int)line, @"%@", message);
+}
+
++ (void)warn:(NSString *)message file:(NSString *)file line:(NSUInteger)line
+{
+    _RCTLogNativeInternal(RCTLogLevelWarning, file.UTF8String, (int)line, @"%@", message);
+}
+
++ (void)error:(NSString *)message file:(NSString *)file line:(NSUInteger)line
+{
+    _RCTLogNativeInternal(RCTLogLevelError, file.UTF8String, (int)line, @"%@", message);
+}
+
++ (void)log:(NSString *)message file:(NSString *)file line:(NSUInteger)line
+{
+    _RCTLogNativeInternal(RCTLogLevelInfo, file.UTF8String, (int)line, @"%@", message);
+}
+
++ (void)trace:(NSString *)message file:(NSString *)file line:(NSUInteger)line
+{
+    _RCTLogNativeInternal(RCTLogLevelTrace, file.UTF8String, (int)line, @"%@", message);
+}
+
+@end