[misc] merge pdf caching into main (#4033)

* [frontend] WIP: pdf caching using service worker -- squashed

Ref: 920fbaa00b31530f7c457a2d93bad5e553798057
Co-Authored-By: Brian Gough <brian.gough@overleaf.com>
Co-Authored-By: Eric Mc Sween <eric.mcsween@overleaf.com>

* [misc] add contentId into the URL for protecting PDF stream contents

* [misc] gracefully handle missing ranges in serviceWorker

* [misc] support PDF stream caching for anonymous users

* [misc] polish header names and add URL to error message when fetch fails

* [misc] polish event handler registration

* [misc] limit serviceWorker scope to /project/ -- trailing slash

This will block the service worker from intercepting requests on the
 project dashboard.

* [misc] add per-request feature flag for enabling PDF stream caching

* [misc] expose compile stats and timings to the frontend

* [misc] serviceWorker: support clsiServerId and compileGroup url params

* [misc] serviceWorker: polish header maps

* [misc] serviceWorker: drop TODO for p-limit -- the browser has a queue

* [misc] serviceWorker: drop verbose log message on every fetch

* [misc] cut down size of diff in backend code

* [misc] add test case for forwarding of pdf caching and metrics details

* [misc] serviceWorker: drop all the log lines

* [misc] serviceWorker: add boundary guards to the compile request regex

Co-authored-by: Brian Gough <brian.gough@overleaf.com>
Co-authored-by: Eric Mc Sween <eric.mcsween@overleaf.com>
GitOrigin-RevId: 4b291b4a4f2866cf07bccf8ec9068f33bbfdc916

services/web/webpack.config.js

@@ -11,6 +11,7 @@ const MODULES_PATH = path.join(__dirname, '/modules')
 
 // Generate a hash of entry points, including modules
 const entryPoints = {
+  serviceWorker: './frontend/js/serviceWorker.js',
   main: './frontend/js/main.js',
   ide: './frontend/js/ide.js',
   style: './frontend/stylesheets/style.less',
@@ -92,6 +93,17 @@ module.exports = {
           },
         ],
       },
+      {
+        test: /serviceWorker.js$/,
+        use: [
+          {
+            loader: 'worker-loader',
+            options: {
+              name: 'serviceWorker.js',
+            },
+          },
+        ],
+      },
       {
         // Pass Less files through less-loader/css-loader/mini-css-extract-
         // plugin (note: run in reverse order)