Sometimes, the context menu click handlers don't seem to get passed any
window object. Here, I'm sending over the workspace id with the
`contextmenu-show` event so that we can resolve our cached copy of the
object in case the value from the click handler is empty.
This PR swaps usage of the `uuid` library for the built-in
`crypto.randomUUID` function, which is available in both NodeJS and the
browser. The built-in function is around 12x faster than the `uuid`
library. The strings produced by the built-in function are fully
compatible with the UUIDv4 standard, so it's an easy switch.
