fix(ios): Fix support for new architecture on react-native 0.74

[gabrieldonadel]

Motivation (required)

When trying to build on iOS with new architecture enabled, user face the following error

Given that we're importing ImagePickerManager.h inside ios/ImagePickerUtils.mm, which imports RNImagePickerSpec.h, we need to rename this file to .mm

After this change a different error shows up regarding ld not finding the following simbols:

ld: Undefined symbols:
  _OBJC_CLASS_$_PHAsset, referenced from:
       in libreact-native-image-picker.a[2](ImagePickerManager.o)
  _OBJC_CLASS_$_PHPhotoLibrary, referenced from:
       in libreact-native-image-picker.a[2](ImagePickerManager.o)
  _OBJC_CLASS_$_PHPickerConfiguration, referenced from:
       in libreact-native-image-picker.a[3](ImagePickerUtils.o)
  _OBJC_CLASS_$_PHPickerFilter, referenced from:
       in libreact-native-image-picker.a[3](ImagePickerUtils.o)
  _OBJC_CLASS_$_PHPickerViewController, referenced from:
       in libreact-native-image-picker.a[2](ImagePickerManager.o)

This can be fixed by specifying the Photos and PhotosUI frameworks inside the podspec file

Test Plan (required)

Manually bump the example app to 0.73.0-rc3 (https://react-native-community.github.io/upgrade-helper/?from=0.73.6&to=0.74.0-rc.3), run RCT_NEW_ARCH_ENABLED=1 pod install and build the app

[gabrieldonadel]

@Johan-dutoit can you please take a look at this when you have some time?

[Johan-dutoit]

🎉 This PR is included in version 7.1.2 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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