Add Isaac VSCode intellisense for host and devcontainers

[j3soon]

As discussed in #75 (comment)

May test for Isaac Sim 4.5.0 (or 5.0.0) and Isaac Lab 2.1.0 (or 2.2.0)

[YuZhong-Chen]

I can give this a try this week. For my current project, I've been manually modifying .vscode/settings.json, but it would be much more convenient to set it up following the official installation method (Isaac Sim 5.0.0 with Isaac Lab 2.2.0).

However, I might not be able to test the host side since I don't have Isaac installed on my host machine—and honestly, it doesn't seem necessary anymore as everything should run fine inside the container.

[j3soon]

@YuZhong-Chen thanks, please go ahead. Some previous references:

• 070b509
• e1106bd