Update hover tooltips for typescript

[flenter]

By adding a HoverProvider and updating the bundled @autometrics/typescript-plugin so it creates special "hover" information as an html-comment which in turn can be parsed by the extension.

This requires autometrics-dev/autometrics-ts#72 to be merged in and released.

TODO before release:

• update @autometrics/typescript-plugin dependency

If people want to test this locally, they need to:

• clone the autometrics-dev/autometrics-ts repo
• checkout the html-comment branch
• run npm install and npm run build
• install it via a relative path (i.e. yarn add "../autometrics-ts/packages/typescript-plugin")

[laulauland]

?.*approved