ESLint parity with the Browsertrix repo (#288)

This copies the rules from the Browsertrix repo, and uses
[`suppress-eslint-errors`](https://www.npmjs.com/package/suppress-eslint-errors)
to suppose the violations. I'll take a pass at cleaning this up at some
point in the future, and let's do our best to address these in the
future as we come across them :)

This'll help ensure new code being added to this repo is held to the
same standard as code in Browsertrix's frontend.

src/replay.ts

@@ -48,6 +48,8 @@ class Replay extends LitElement {
 
   firstUpdated() {
     window.addEventListener("message", (event) => this.onReplayMessage(event));
+    // TODO: Fix this the next time the file is edited.
+    // eslint-disable-next-line @typescript-eslint/promise-function-async
     navigator.serviceWorker.addEventListener("message", (event) =>
       this.handleAuthMessage(event),
     );