Config to specify IIFE name or disable it altogether

Before that, I want to run an alternative by you: would it make more sense to add this to defineContentScript (as an option like cssInjectionMode, matches, etc) instead of wxt.config.ts?

export default defineContentScript({
  iffeName: "example",
  // OR `globalName: string | boolean`, letting people disable the iffe name in the  output as well as give it a different name.

  main() {
    // ...
  }
})

In this version, it would default to true and the name would be generated based on the content script name, but in the next major version would could change the default to false so a name isn't even generated in the first place.

— Originally posted by @aklinker1 in https://github.com/wxt-dev/wxt/pull/1897#pullrequestreview-3385640996