Add ts api for third party extensions

[nosknut]

Make the most relevant parts of the commands available through a javascript api, as documented here:
https://code.visualstudio.com/api/references/vscode-api#extensions

Context:
I am working on a QOL plugin that improves how the arduino extension interacts with the wokwi extension, as well as minor things like automatically selecting a sketch when opening it. To make it a seamless experience however I need direct access to these methods.

[nosknut]

Here is a PR #1667