Typescript config parity with Browsertrix repo (#289)

Follow-up from #288 

This matches the strictness rules with the Browsertrix repo,
specifically `noImplicitAny`, and then adds `// @ts-expect-error`s to
suppress existing errors this change raises. This'll help us keep code
quality high moving forward.

Going to just directly merge this once it passes CI; as with #288, this
doesn't change any code, just comments.

src/pageentry.ts

@@ -386,6 +386,7 @@ class PageEntry extends LitElement {
     return this.onReplay(event, true);
   }
 
+  // @ts-expect-error [// TODO: Fix this the next time the file is edited.] - TS7006 - Parameter 'data' implicitly has an 'any' type.
   sendChangeEvent(data, reload: boolean) {
     this.dispatchEvent(
       new CustomEvent("coll-tab-nav", {
@@ -401,6 +402,7 @@ class PageEntry extends LitElement {
     this.dispatchEvent(new CustomEvent("delete-page", { detail: { page } }));
   }
 
+  // @ts-expect-error [// TODO: Fix this the next time the file is edited.] - TS7006 - Parameter 'event' implicitly has an 'any' type.
   onSendSelToggle(event) {
     const page = this.page!.id;
     const selected = event.currentTarget.checked;