Use simdutf for faster string encoding/decoding (#976)

Author: wh201906

.gitmodules

@@ -4,3 +4,6 @@
 [submodule "packages/react-native-quick-crypto/deps/ncrypto"]
 	path = packages/react-native-quick-crypto/deps/ncrypto
 	url = https://github.com/nodejs/ncrypto.git
+[submodule "packages/react-native-quick-crypto/deps/simdutf"]
+	path = packages/react-native-quick-crypto/deps/simdutf
+	url = https://github.com/simdutf/simdutf.git

example/ios/Podfile.lock

@@ -2815,7 +2815,7 @@ SPEC CHECKSUMS:
   NitroMmkv: afbc5b2fbf963be567c6c545aa1efcf6a9cec68e
   NitroModules: 11bba9d065af151eae51e38a6425e04c3b223ff3
   OpenSSL-Universal: 9110d21982bb7e8b22a962b6db56a8aa805afde7
-  QuickCrypto: 2084e4b3fe8ec7c33d57c446927b90d7e266b5f0
+  QuickCrypto: 706bcc29f0cf2b628721f705bd700ad906a43f91
   RCT-Folly: 846fda9475e61ec7bcbf8a3fe81edfcaeb090669
   RCTDeprecation: c4b9e2fd0ab200e3af72b013ed6113187c607077
   RCTRequired: e97dd5dafc1db8094e63bc5031e0371f092ae92a