feat: RCTConvert to support UIModalPresentationStyle (#43297)

Summary:
Currently, the ability to convert JS values to `UIModalPresentationStyle` is not present directly on `RCTConvert`.

In the RN code base itself, there's not a lot of need to do this type of conversion, but in community modules, presenting ViewControllers can be a fairly common scenario and it'd be nice to be able to use this conversion directly from `RCTConvert`, rather than from `RCTModalHostViewManager`, as it'd improve its "discoverability" and consistency.

If someone relied on this, then it's technically speaking a breaking change but I'd say it's for the better, and searching `#import <React/RCTModalHostViewManager.h>` on github doesn't reveal a lot of results.

## Changelog:

[IOS] [ADDED] - RCTConvert to support UIModalPresentationStyle

For more details, see:
https://reactnative.dev/contributing/changelogs-in-pull-requests

Pull Request resolved: https://github.com/facebook/react-native/pull/43297

Test Plan:
Tested using RN Tester

https://github.com/facebook/react-native/assets/1566403/6e62df86-dde3-47b0-b2e9-bb6b483cadf6

Reviewed By: fkgozali

Differential Revision: D54635896

Pulled By: dmytrorykun

fbshipit-source-id: c6747857830762cd0333c31c287954f3f10d4954

packages/react-native/React/Base/RCTConvert.h

@@ -80,6 +80,7 @@ typedef NSURL RCTFileURL;
 + (UIReturnKeyType)UIReturnKeyType:(id)json;
 + (UIUserInterfaceStyle)UIUserInterfaceStyle:(id)json API_AVAILABLE(ios(12));
 + (UIInterfaceOrientationMask)UIInterfaceOrientationMask:(NSString *)orientation;
++ (UIModalPresentationStyle)UIModalPresentationStyle:(id)json;
 
 #if !TARGET_OS_TV
 + (UIDataDetectorTypes)UIDataDetectorTypes:(id)json;

packages/react-native/React/Base/RCTConvert.mm

@@ -510,6 +510,17 @@ RCT_ENUM_CONVERTER(
     NSNotFound,
     unsignedIntegerValue)
 
+RCT_ENUM_CONVERTER(
+    UIModalPresentationStyle,
+    (@{
+      @"fullScreen" : @(UIModalPresentationFullScreen),
+      @"pageSheet" : @(UIModalPresentationPageSheet),
+      @"formSheet" : @(UIModalPresentationFormSheet),
+      @"overFullScreen" : @(UIModalPresentationOverFullScreen),
+    }),
+    UIModalPresentationFullScreen,
+    integerValue)
+
 RCT_ENUM_CONVERTER(
     UIViewContentMode,
     (@{

packages/react-native/React/Views/RCTModalHostViewManager.h

@@ -9,12 +9,6 @@
 #import <React/RCTInvalidating.h>
 #import <React/RCTViewManager.h>
 
-@interface RCTConvert (RCTModalHostView)
-
-+ (UIModalPresentationStyle)UIModalPresentationStyle:(id)json;
-
-@end
-
 typedef void (^RCTModalViewInteractionBlock)(
     UIViewController *reactViewController,
     UIViewController *viewController,

packages/react-native/React/Views/RCTModalHostViewManager.m

@@ -14,21 +14,6 @@
 #import "RCTShadowView.h"
 #import "RCTUtils.h"
 
-@implementation RCTConvert (RCTModalHostView)
-
-RCT_ENUM_CONVERTER(
-    UIModalPresentationStyle,
-    (@{
-      @"fullScreen" : @(UIModalPresentationFullScreen),
-      @"pageSheet" : @(UIModalPresentationPageSheet),
-      @"formSheet" : @(UIModalPresentationFormSheet),
-      @"overFullScreen" : @(UIModalPresentationOverFullScreen),
-    }),
-    UIModalPresentationFullScreen,
-    integerValue)
-
-@end
-
 @interface RCTModalHostShadowView : RCTShadowView
 
 @end