Support (Swift-only) GroupActivities Framework

### Steps to Reproduce

1. Create a new iOS application with target iOS version 15.5
2. Try to import the GroupActivities framework

### Expected Behavior

Should be able to import GroupActivities and use the related classes and interfaces such as GroupActivity.

### Actual Behavior

GroupActivities framework is unavailable. Am I missing something? Is there a plan to support the GroupActivities framework in Xamarin iOS?

### Environment

Version information

```
=== Visual Studio Community 2019 for Mac ===

Version 8.10.25 (build 2)
Installation UUID: 88bf8d2d-312f-4cfc-83e5-1faf67cdf8da
GTK+ 2.24.23 (Raleigh theme)
Xamarin.Mac 6.18.0.23 (d16-6 / 088c73638)

Package version: 612000182

=== Mono Framework MDK ===

Runtime:
Mono 6.12.0.182 (2020-02/6051b710727) (64-bit)
Package version: 612000182

=== Roslyn (Language Service) ===

3.10.0-4.21269.26+029847714208ebe49668667c60ea5b0a294e0fcb

=== NuGet ===

Version: 5.9.0.7134

=== .NET SDK (x64) ===

SDK: /usr/local/share/dotnet/x64/sdk/6.0.106/Sdks
SDK Versions:
6.0.106
5.0.408
3.1.420
MSBuild SDKs: /Applications/Visual Studio.app/Contents/Resources/lib/monodevelop/bin/MSBuild/Current/bin/Sdks

=== .NET Core Runtime ===

Runtime: /usr/local/share/dotnet/x64/dotnet
Runtime Versions:
6.0.6
5.0.17
3.1.26

=== .NET Core 3.1 SDK ===

SDK: 3.1.420

=== .NET 5.0 SDK ===

SDK: 5.0.408

=== Xamarin.Profiler ===

Version: 1.8.0.22
Location: /Applications/Xamarin Profiler.app/Contents/MacOS/Xamarin Profiler

=== Updater ===

Version: 11

=== Xamarin.Android ===

Version: 12.2.8.3 (Visual Studio Community)
Commit: xamarin-android/d17-1/fafdba7
Android SDK: /Users/eloskutov/Library/Developer/Xamarin/android-sdk-macosx
Supported Android versions:
None installed

SDK Tools Version: 26.1.1
SDK Platform Tools Version: 30.0.4
SDK Build Tools Version: 30.0.2

Build Information:
Mono: dffa5ab
Java.Interop: xamarin/java.interop/d17-1@7ac33610
ProGuard: Guardsquare/proguard/v7.0.1@912d149
SQLite: xamarin/sqlite/3.37.1@0893b3b
Xamarin.Android Tools: xamarin/xamarin-android-tools/d17-1@db125a7

=== Eclipse Temurin JDK ===

Java SDK: /Library/Java/JavaVirtualMachines/temurin-8.jdk/Contents/Home
1.8.0.302
Android Designer EPL code available here:
https://github.com/xamarin/AndroidDesigner.EPL

=== Android SDK Manager ===

Version: 16.10.0.13
Hash: 1b81df5
Branch: remotes/origin/d16-10
Build date: 2021-11-12 00:17:32 UTC

=== Android Device Manager ===

Version: 16.10.0.15
Hash: 89dcc0b
Branch: remotes/origin/d16-10
Build date: 2021-11-12 00:17:52 UTC

=== Xamarin Designer ===

Version: 16.11.0.60
Hash: 56f9b80b0
Branch: remotes/origin/d16-11
Build date: 2021-12-15 01:44:16 UTC

=== Apple Developer Tools ===

Xcode 13.4.1 (20504)
Build 13F100

=== Xamarin.Mac ===

Version: 8.10.0.5 (Visual Studio Community)
Hash: 96b3edb6d
Branch: d17-2
Build date: 2022-05-18 07:32:06-0400

=== Xamarin.iOS ===

Version: 15.10.0.5 (Visual Studio Community)
Hash: 96b3edb6d
Branch: d17-2
Build date: 2022-05-18 07:32:07-0400

=== Build Information ===

Release ID: 810250002
Git revision: 0620af530b5800e0eada4882ce1c3d4dad7e53d3
Build date: 2022-06-15 13:41:26-04
Build branch: release-8.10

=== Operating System ===

Mac OS X 12.4.0
Darwin 21.5.0 Darwin Kernel Version 21.5.0
Tue Apr 26 21:08:37 PDT 2022
root:xnu-8020.121.3~4/RELEASE_ARM64_T6000 x86_64

```