Feature proposal: include string constants for the runtime download links in <WindowsAppSDK-VersionInfo.h>

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### Describe the bug

This isn't bug, but just a feature request.

I thought it would be great if in , or some other relevant header, you could include the download links for the Windows App Runtime as string constants. That way if we have a setup installer that downloads and installs the runtime, it will be easy to keep the download link accurate and up to date.

Right now I use a formatted string (`L"https://aka.ms/windowsappsdk/%d.%d/latest/windowsappruntimeinstall-%s.exe"`), and then fill in the placeholders with release number and architecture, but I suspect that's not a very good way of doing things.

### Steps to reproduce the bug

Not a bug.

### Expected behavior

_No response_

### Screenshots

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### NuGet package version

None

### Packaging type

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### Windows version

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### IDE

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### Additional context

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Start by reviewing and the existing version information and release-link generation path. Determine how architecture and release numbers are represented, then define the string constants so the runtime download links remain accurate; done means consumers can use the constants instead of formatting the aka.ms URL themselves.

Written by the indexing model from the issue text.