feat: allow use of RCTRootViewFactory from Swift

[okwasniewski]

Summary:

The goal of this PR is to allow the usage of RCTRootViewFactory from Swift. The issue with RCTTurboModuleManager.h is that it uses C++ in its header file, which is not allowed in Swift, making this initializer unavailable.

This PR allows users to just pass configuration + adds a nullable annotation to bundleURL.

Example usage:

import Foundation
import UIKit
import React
import React_RCTAppDelegate

@main
class AppDelegate: NSObject, UIApplicationDelegate {
  var window: UIWindow?
  private var rootViewFactory: RCTRootViewFactory?
  
  func application(
    _ application: UIApplication,
    didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey : Any]? = nil
  ) -> Bool {
   
    // Create config
    let config = RCTRootViewFactoryConfiguration(
      bundleURL: self.bundleURL(),
      newArchEnabled: true,
      turboModuleEnabled: true,
      bridgelessEnabled: false
    )
    
    // Create rootview factory
    rootViewFactory = RCTRootViewFactory(configuration: config)
    
    // Create rootview
    let rootView = rootViewFactory?.view(withModuleName: "RN0740RC4")
    let rootViewController = UIViewController()
    rootViewController.view = rootView
    
    // Create window and assign view controller
    window = UIWindow(frame: UIScreen.main.bounds)
    window?.rootViewController = rootViewController;
    window?.makeKeyAndVisible()
    
    return true
  }
  
  func bundleURL() -> URL? {
    RCTBundleURLProvider.sharedSettings().jsBundleURL(forBundleRoot: "index")
  }
}

Changelog:

[IOS] [FIXED] - Allow usage of RCTRootViewFactory from Swift

Test Plan:

CI Green, check usage of initializer without turbo module delegate

[analysis-bot]

Platform	Engine	Arch	Size (bytes)	Diff
android	hermes	arm64-v8a	19,385,121	+5
android	hermes	armeabi-v7a	n/a	--
android	hermes	x86	n/a	--
android	hermes	x86_64	n/a	--
android	jsc	arm64-v8a	22,760,089	+6
android	jsc	armeabi-v7a	n/a	--
android	jsc	x86	n/a	--
android	jsc	x86_64	n/a	--

Base commit: 44d59ea
Branch: main

[okwasniewski]

Hey @cipolleschi could you take a look at this? 🙏

[cipolleschi]

Changes looks good to me, but we had to fix a couple of things that conflicts with the RCTRootViewFactory. Can you rebase on top of main and fix the conflicts?

[okwasniewski]

Hey @cipolleschi thanks for reviewing - rebased

[facebook-github-bot]

@cipolleschi has imported this pull request. If you are a Meta employee, you can view this diff on Phabricator.

[facebook-github-bot]

@cipolleschi merged this pull request in 5aea518.

[github-actions]

This pull request was successfully merged by @okwasniewski in 5aea518.

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