Enrich device develop experience

[ghost]

There might be some improvements on following aspects:
Provide better IntelliSense and Library management experience
Provide well-structured documents and sample code
Provide more project templates for different purpose
Improve experience for developing big/complex project

[czgtest]

we will consider improving the extension.Thank you for your valuable suggestions.

[czgtest]

should sync with Chaoyi Yuan about more detail for improvements

[elektronikworkshop]

Hi, I'm currently implementing the auto IntelliSense feature, see my comment on #438 and others.

[robotdad]

This looks like a list of things from the previous project team. I think many of these are tracked by other issues, including the one @elektronikworkshop mentions. Please reactivate if I have misunderstood.