GestureRecognizer minimum contact count properties are missing

### Describe the bug

The UWP [GestureRecognizer](https://learn.microsoft.com/en-us/uwp/api/windows.ui.input.gesturerecognizer?view=winrt-26100) has several properties allowing us to specify the minimum number of contact points for a gesture like [GestureRecognizer.TranslationMinContactCount](https://learn.microsoft.com/en-us/uwp/api/windows.ui.input.gesturerecognizer.translationmincontactcount?view=winrt-26100).

The WinAppSDK [GestureRecognizer](https://learn.microsoft.com/en-us/windows/windows-app-sdk/api/winrt/microsoft.ui.input.gesturerecognizer.-ctor?view=windows-app-sdk-1.6) does not longer have those properties.

I need to restrict the gestures to 2 contacts interactions. Those APIs should be re-added on WinAppSDK to have the same feature level as in UWP.

### Steps to reproduce the bug

Create a WinAppSDk application and try to set the [GestureRecognizer.TranslationMinContactCount](https://learn.microsoft.com/en-us/uwp/api/windows.ui.input.gesturerecognizer.translationmincontactcount?view=winrt-26100) property

### Expected behavior

_No response_

### Screenshots

_No response_

### NuGet package version

Windows App SDK 1.7 Experimental 3: 1.7.250127003-experimental3

### Packaging type

Packaged (MSIX)

### Windows version

Windows 11 version 24H2 (22621, October 2024 Update)

### IDE

Visual Studio 2022

### Additional context

_No response_

Start with the WinAppSDK GestureRecognizer API and compare it with the linked UWP GestureRecognizer documentation, especially the minimum contact count properties. Trace the existing WinAppSDK gesture recognizer implementation and its tests, then verify that the corresponding properties support restricting gestures to two contacts.

Written by the indexing model from the issue text.