Use a standard export statement in the web/pdfjs.js file

This removes the only remaining old and non-standard handling of exports in the `web/`-folder, since some initial attempts at outputting JavaScript modules in the builds have identified this file as a potential problem.
While this uses a hard-coded list, for overall simplicity, I don't believe that that's a big problem since:
 - Generating this file automatically would require a bunch more parsing *every single time* that the library is built.
 - The official API-surface doesn't change often enough for this to really impede development in any significant way.
 - The added unit-test helps ensure that this list cannot accidentally become outdated.

web/pdfjs.js

@@ -12,8 +12,97 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-/* globals module */
 
-"use strict";
+const {
+  AbortException,
+  AnnotationEditorLayer,
+  AnnotationEditorParamsType,
+  AnnotationEditorType,
+  AnnotationEditorUIManager,
+  AnnotationLayer,
+  AnnotationMode,
+  build,
+  CMapCompressionType,
+  createValidAbsoluteUrl,
+  DOMSVGFactory,
+  FeatureTest,
+  getDocument,
+  getFilenameFromUrl,
+  getPdfFilenameFromUrl,
+  getXfaPageViewport,
+  GlobalWorkerOptions,
+  ImageKind,
+  InvalidPDFException,
+  isDataScheme,
+  isPdfFile,
+  loadScript,
+  MissingPDFException,
+  noContextMenu,
+  normalizeUnicode,
+  OPS,
+  PasswordResponses,
+  PDFDataRangeTransport,
+  PDFDateString,
+  PDFWorker,
+  PermissionFlag,
+  PixelsPerInch,
+  PromiseCapability,
+  RenderingCancelledException,
+  renderTextLayer,
+  setLayerDimensions,
+  shadow,
+  SVGGraphics,
+  UnexpectedResponseException,
+  updateTextLayer,
+  Util,
+  VerbosityLevel,
+  version,
+  XfaLayer,
+} = globalThis.pdfjsLib;
 
-module.exports = globalThis.pdfjsLib;
+export {
+  AbortException,
+  AnnotationEditorLayer,
+  AnnotationEditorParamsType,
+  AnnotationEditorType,
+  AnnotationEditorUIManager,
+  AnnotationLayer,
+  AnnotationMode,
+  build,
+  CMapCompressionType,
+  createValidAbsoluteUrl,
+  DOMSVGFactory,
+  FeatureTest,
+  getDocument,
+  getFilenameFromUrl,
+  getPdfFilenameFromUrl,
+  getXfaPageViewport,
+  GlobalWorkerOptions,
+  ImageKind,
+  InvalidPDFException,
+  isDataScheme,
+  isPdfFile,
+  loadScript,
+  MissingPDFException,
+  noContextMenu,
+  normalizeUnicode,
+  OPS,
+  PasswordResponses,
+  PDFDataRangeTransport,
+  PDFDateString,
+  PDFWorker,
+  PermissionFlag,
+  PixelsPerInch,
+  PromiseCapability,
+  RenderingCancelledException,
+  renderTextLayer,
+  setLayerDimensions,
+  shadow,
+  SVGGraphics,
+  UnexpectedResponseException,
+  updateTextLayer,
+  Util,
+  VerbosityLevel,
+  version,
+  XfaLayer,
+};