iOS support keyboardType ASCIICapableNumberPad (#20597)

Summary:
React native is missing a keyboard type for iOS so I included support for it. So it can be used in react native app
https://developer.apple.com/documentation/uikit/uikeyboardtype/uikeyboardtypeasciicapablenumberpad

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Pull Request resolved: https://github.com/facebook/react-native/pull/20597

Differential Revision: D14103498

Pulled By: cpojer

fbshipit-source-id: b0aa17f3e527734c6e90eadc73c96db4dd002698

React/Base/RCTConvert.m

@@ -355,6 +355,7 @@ RCT_ENUM_CONVERTER(UIKeyboardType, (@{
   @"decimal-pad": @(UIKeyboardTypeDecimalPad),
   @"twitter": @(UIKeyboardTypeTwitter),
   @"web-search": @(UIKeyboardTypeWebSearch),
+  @"ascii-capable-number-pad": @(UIKeyboardTypeASCIICapableNumberPad),
   // Added for Android compatibility
   @"numeric": @(UIKeyboardTypeDecimalPad),
 }), UIKeyboardTypeDefault, integerValue)