fetch wasm file should append baseUrl base on currenScript running env

[joeyrenhuang]

Encountered a problem when use module federation. fetch wasm failed coz wasm locates different to window.location.origin, so here will get running env before fetch

[zuckschwerdt]

I encountered the same problem of needing to resolve the wasm file relative to the script url and not the current window.location.

@joeyrenhuang can you rebase to include the latest change (#50)?

[zuckschwerdt]

I've confirmed this working for my use-case, but it needs to not match @ in getRunningScript() so we don't prepend the function or code. For examples see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Error/stack
I.e. apply zuckschwerdt@eead35b