[api-major] Output JavaScript modules in the builds (issue 10317)

At this point in time all browsers, and also Node.js, support standard `import`/`export` statements and we can now finally consider outputting modern JavaScript modules in the builds.[1]

In order for this to work we can *only* use proper `import`/`export` statements throughout the main code-base, and (as expected) our Node.js support made this much more complicated since both the official builds and the GitHub Actions-based tests must keep working.[2]
One remaining issue is that the `pdf.scripting.js` file cannot be built as a JavaScript module, since doing so breaks PDF scripting.

Note that my initial goal was to try and split these changes into a couple of commits, however that unfortunately didn't really work since it turned out to be difficult for smaller patches to work correctly and pass (all) tests that way.[3]
This is a classic case of every change requiring a couple of other changes, with each of those changes requiring further changes in turn and the size/scope quickly increasing as a result.

One possible "issue" with these changes is that we'll now only output JavaScript modules in the builds, which could perhaps be a problem with older tools. However it unfortunately seems far too complicated/time-consuming for us to attempt to support both the old and modern module formats, hence the alternative would be to do "nothing" here and just keep our "old" builds.[4]

---
[1] The final blocker was module support in workers in Firefox, which was implemented in Firefox 114; please see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/import#browser_compatibility

[2] It's probably possible to further improve/simplify especially the Node.js-specific code, but it does appear to work as-is.

[3] Having partially "broken" patches, that fail tests, as part of the commit history is *really not* a good idea in general.

[4] Outputting JavaScript modules was first requested almost five years ago, see issue 10317, and nowadays there *should* be much better support for JavaScript modules in various tools.

web/pdfjs.js

@@ -35,7 +35,6 @@ const {
   InvalidPDFException,
   isDataScheme,
   isPdfFile,
-  loadScript,
   MissingPDFException,
   noContextMenu,
   normalizeUnicode,
@@ -81,7 +80,6 @@ export {
   InvalidPDFException,
   isDataScheme,
   isPdfFile,
-  loadScript,
   MissingPDFException,
   noContextMenu,
   normalizeUnicode,