<!-- Enter a brief description/summary of your PR here. What does it
fix/what does it change/how was it tested (even manually, if necessary)?
-->
## Summary of the Pull Request
This PR introduces necessary changes to make the CmdPal.Apps extension
compatible with NativeAOT publishing. The main updates include:
1. Project configuration updates: Added NativeAOT-related properties to
the .csproj.
2. Native interop adjustments:
> - Introduced NativeMethods.json and used
[CsWin32](https://github.com/microsoft/cswin32) to generate P/Invoke
bindings.
> - Replaced some DllImport declarations with source-generated
[LibraryImport] for improved AOT support.
**WARNING:** This PR will probably blow up all in-flight PRs
at some point in the early days of CmdPal, two of us created seperate
`Exts` and `exts` dirs. Depending on what the casing was on the branch
that you checked one of those out from, it'd get stuck like that on your
PC forever.
Windows didn't care, so we never noticed.
But GitHub does care, and now browsing the source on GitHub is basically
impossible.
Closes#38081