Map textContentType strings to Objective-C constants

[levibuzolic]

Fixes #22578

Currently the only textContentType values that work are: username, password, location, name and nickname. This is due to the strings provided by React Native not matching up with the underlying string constants used in iOS (with the exception of the aforementioned types). Issue #22578 has more detail examples/explanation.

Test Plan:

Added a Text Content Type example to the RNTester app which shows two examples which weren't previously working.

Note: In my testing, most (if not all) textContentType values don't work on the simulator, instead they need to be tested on a real device.

Before	After

Changelog:

[iOS] [Fixed] - Fixes textContentTypes not working by mapping textContentType strings to Objective-C constants - Fixes #22578

[facebook-github-bot]

@shergin is landing this pull request. If you are a Facebook employee, you can view this diff on Phabricator.

[react-native-bot]

@levibuzolic merged commit 077386a into facebook:master.

[shergin]

Ooops, this diff was reverted because of some internal breakage. I will try to understand the exact reason and fix later this week.

[elicwhite]

This PR failed with this log:

Summary: 
js/react-native-github/Libraries/Text/TextInput/RCTBaseTextInputView.m:238:83: error: use of undeclared identifier 'UITextContentTypeNewPassword'; did you mean 'UITextContentTypePassword'?
[CONTEXT]                 NSDictionary<NSString *, NSString *> * extras = @{@"newPassword": UITextContentTypeNewPassword,
[CONTEXT]                                                                                   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
js/react-native-github/Libraries/Text/TextInput/RCTBaseTextInputView.m:239:83: error: use of undeclared identifier 'UITextContentTypeOneTimeCode'; did you mean 'UITextContentTypePostalCode'?
[CONTEXT]                                                                   @"oneTimeCode": UITextContentTypeOneTimeCode};
[CONTEXT]                                                                                   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
stderr: js/react-native-github/Libraries/Text/TextInput/RCTBaseTextInputView.m:238:83: error: use of undeclared identifier 'UITextContentTypeNewPassword'; did you mean 'UITextContentTypePassword'?
[CONTEXT]                 NSDictionary<NSString *, NSString *> * extras = @{@"newPassword": UITextContentTypeNewPassword,
[CONTEXT]                                                                                   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
js/react-native-github/Libraries/Text/TextInput/RCTBaseTextInputView.m:239:83: error: use of undeclared identifier 'UITextContentTypeOneTimeCode'; did you mean 'UITextContentTypePostalCode'?
[CONTEXT]                                                                   @"oneTimeCode": UITextContentTypeOneTimeCode};
[CONTEXT]                                                                                   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~

[janicduplessis]

Probably needs some #ifdef around the constants that are not defined in older ios versions.