Add Support Offline Mode for VSIX ProjectTemplate

[ghost1372]

Fix microsoft/microsoft-ui-xaml#9535

If there is no internet connection, the project will not be created Because of adding nuget package (wasdk) dynamically

This PR checks the internet connection:

• If the internet is available And the latest version is available as a cache/Locally, Installs the latest cached version.
• If the cached/Local version is not available, the latest version will be installed from nuget.org
• If the internet is not available, then the latest version will be installed from cache/Local

Also i Changed IVsPackageInstaller to IVsPackageInstaller2 because there is a Method Called InstallLatestPackage which can install latest version.

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[Scottj1s]

@ghost1372 thanks so much for this contribution! we'll look at getting it merged very soon.

[ghost1372]

I merged latest changes. can anyone review this pr? @bpulliam @Scottj1s

[mominshaikhdevs]

I believe this PR should be merged.