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.

A microsoft employee must use /azp run to validate using the pipelines below.

WARNING:
Comments made by azure-pipelines bot maybe inaccurate.
Please see pipeline link to verify that the build is being ran.

For status checks on the main branch, please use TransportPackage-Foundation-PR
(https://microsoft.visualstudio.com/ProjectReunion/_build?definitionId=81063&_a=summary)
and run the build against your PR branch with the default parameters.

[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