Feature proposal:Hope to read Pri file resource content from stream

### Describe the bug

Feature proposal:Hope to read ```Pri``` file resource content from stream

##### ----------------------------------

希望能从流中读取 ```Pri``` 文件的信息

----------------------------------


Currently, the resource content of the ```Pri``` file can be read through the specific file path. However, in some scenarios, when the ```appxpackaging.h``` API is used to parse an application package, the ```IStream``` corresponding to ```resources.pri``` in the installation package can be obtained. The ```ResourceLoader``` of ```WASDK``` does not have a corresponding read method.

##### ----------------------------------

目前读取 ```Pri``` 文件的资源内容可以通过具体的文件路径读取。但在一些场景中，使用 ```appxpackaging.h``` 下的 ```API``` 解析应用包时，可以获取安装包里 ```resources.pri``` 对应的 ```IStream```，```WASDK``` 的 ```ResourceLoader``` 并没有对应的读取方法，希望能添加类似的实现。

----------------------------------

```appxpackaging.h API```:https://learn.microsoft.com/windows/win32/api/appxpackaging/
```Win32 IStream```:https://learn.microsoft.com/windows/win32/stg/istream-compound-file-implementation
```ResourceLoader```:https://learn.microsoft.com/zh-cn/windows/windows-app-sdk/api/winrt/microsoft.windows.applicationmodel.resources.resourceloader.-ctor?view=windows-app-sdk-1.6#microsoft-windows-applicationmodel-resources-resourceloader-ctor(system-string-system-string)

----------------------------------

### Steps to reproduce the bug

See description

### Expected behavior

See description

### Screenshots

See description

### NuGet package version

Windows App SDK 1.6.3: 1.6.250108002

### Packaging type

Packaged (MSIX)

### Windows version

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

### IDE

Visual Studio 2022

### Additional context

None

Start with the ResourceLoader API and the appxpackaging.h/IStream scenario described in the issue, comparing it with the existing path-based PRI loading. Done means ResourceLoader can obtain resource content from a resources.pri IStream for the described packaged-app case.

Written by the indexing model from the issue text.