Extract Flow types and constants (#49614)

Summary:
This change refactors the script to prebuild ios dependencies by:
- factoring out the constants
- factoring out the flow type definitions
- factoring out the .gitignore

bypass-github-export-check

## Changelog:

[INTERNAL] - Factor out flow types, constants and gitignore

Pull Request resolved: #49614

Test Plan:
Tested in this `AppDelegate.mm`:

Imports:

```obj-c
#import "AppDelegate.h"
#import <glog/logging.h>
#import <double-conversion.h>
#include <fmt/core.h>
#include <boost/assert.hpp>
#include <fast_float/fast_float.h>
#include <string>
#import <SocketRocket/SRWebSocket.h>
```

Code:
```obj-c
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
  std::string input = "3.1416 xyz ";
  double_conversion::DoubleToStringConverter::EcmaScriptConverter();
  LOG(INFO) << "Hello from GLOG";
  fmt::print("Hello, world from FMT!\n");
  BOOST_ASSERT(100 == 100);
  double result;
  fast_float::from_chars(input.data(), input.data() + input.size(), result);
  LOG(INFO) << "Answer :" << result;

  NSArray *frameworks = [NSBundle allFrameworks];

  for (NSBundle *framework in frameworks) {
    NSString *frameworkName = framework.bundleURL.lastPathComponent;
    if ([frameworkName isEqualToString: @"ReactNativeDependencies.framework"]) {
      NSBundle *bundle = [NSBundle bundleWithURL:[framework bundleURL]];
      NSURL *bundleURL = [bundle URLForResource:@"ReactNativeDependencies_glog" withExtension:@"bundle"];
      NSBundle *resourceBundle = [NSBundle bundleWithURL:bundleURL];
      NSURL* url = [resourceBundle URLForResource:@"PrivacyInfo" withExtension:@"xcprivacy"];
      if (url == nil) {
        throw [NSException exceptionWithName:@"ResourceNotFoundException"
                                       reason:@"Could not find PrivacyInfo.xcprivacy in ReactNativeDependencies_glog bundle"
                                     userInfo:nil];
      }
      break;
    }
  }
  return YES;
}
```

Reviewed By: cortinico

Differential Revision: D70172536

Pulled By: cipolleschi

fbshipit-source-id: 91589693fd24e2b0d6d67759fb9fbc86841f4d13

Author: chrfalch

.gitignore

@@ -142,9 +142,7 @@ vendor/
 /packages/react-native/sdks/hermes-engine/hermes-engine-from-local-source-dir.tar.gz
 
 # iOS prebuilds
-/packages/react-native/third-party/glog
-/packages/react-native/third-party/.swiftpm
-/packages/react-native/third-party/.build
+/packages/react-native/third-party/
 fix_*.patch
 *.xcframework
 

scripts/releases/prebuild/constants.js

@@ -0,0 +1,18 @@
+/**
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow
+ * @format
+ * @oncall react_native
+ */
+
+module.exports = {
+  SOURCE_FOLDER: 'source', // This is where the original structure will be stored
+  TARGET_FOLDER: 'target', // This is where the final structure will be stored
+  HEADERS_FOLDER: 'headers', // This is where the headers will be stored
+  SCRIPTS_FOLDER: 'scripts', // This is where the scripts will be stored
+  RESOURCES_FOLDER: 'Resources', // This is where the resources will be stored in side the target folder
+};

scripts/releases/prebuild/types.js

@@ -0,0 +1,62 @@
+/**
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow
+ * @format
+ * @oncall react_native
+ */
+
+/*::
+export type Folder = RegExp;
+
+export type Files = $ReadOnly<{
+  headers: $ReadOnlyArray<string>,
+  sources: $ReadOnlyArray<string>,
+  resources?: $ReadOnlyArray<string>,
+  // Relative path from target root to where the header files should be copied.
+  // Can be used to ensure header search paths like <double-conversion/double-conversion.h>
+  // are correctly resolved.
+  headerTargetFolder?: string,
+  headerSkipFolderNames?: string,
+}>;
+
+export type Define = $ReadOnly<{
+  name: string,
+  value?: string,
+}>;
+
+export type Settings = $ReadOnly<{
+  headerSearchPaths?: $ReadOnlyArray<string>,
+  defines?: $ReadOnlyArray<Define>,
+  compilerFlags?: $ReadOnlyArray<string>,
+  linkedLibraries?: $ReadOnlyArray<string>,
+  publicHeaderFiles: string,
+  linkerSettings?: $ReadOnlyArray<string>
+}>;
+
+export type Dependency = $ReadOnly<{
+  name: string,
+  version: string,
+  url: URL,
+  prepareScript?: string,
+  files: Files,
+  settings: Settings,
+  disabled?: boolean,
+  dependencies?: $ReadOnlyArray<string>,
+}>;
+
+export type Platform =
+  'iOS' |
+  'iOS Simulator' |
+  'macOS' |
+  'macOS,variant=Mac Catalyst' |
+  'tvOS' |
+  'tvOS Simulator' |
+  'visionOS' |
+  'visionOS Simulator';
+*/
+
+module.exports = {};