Use a verified publisher on the VS Code Marketplace for the official extension

[dslatkin]

Problem statement

Right now if you install the extension from VS Code's marketplace, you get the following message:

It would be nice if this extension, being the official one, used a verified publisher. This would give the blue checkmark as well, making it much more obvious which one to try using first.

Right now the list of extensions look like this:

Proposed solution

I think it goes something like this:

1. Create a publisher
2. Verify that publisher with godotengine.org
3. Update the publisher in package.json
4. Republish

There's also a link here to get help from the marketplace team if running into any issues.