Remove JWT implementation and related files

- Deleted the JWTCoding.h and JWTCoding.m files, which contained the main JWT interface for encoding and decoding.
- Removed JWT.h, Map.modulemap, JWTBase64Coder.h, JWTBase64Coder.m, JWTDeprecations.h, JWTErrorDescription.h, and JWTErrorDescription.m files, which included various supplementary functionalities and error handling for JWT.
- Eliminated the LICENSE and README.md files associated with the JWT library.
- Updated package.json to add a script for pod installation in the iOS project directory.

Author: hebertcisco

ios/CodePush.xcodeproj/project.pbxproj

@@ -1,6 +1,13 @@
 #import "CodePush.h"
 #include <CommonCrypto/CommonDigest.h>
+
+#if __has_include(<JWT/JWT.h>)
+#import <JWT/JWT.h>
+#elif __has_include(<JWT.h>)
+#import <JWT.h>
+#else
 #import "JWT.h"
+#endif
 
 @implementation CodePushUpdateUtils