Implement Webauthn 🎉 (#5088)

* Implement Webauthn 🎉

* Share hexifyAB

* Move hr inside template and add AttestationChallenges janitor daemon

* Apply suggestions from code review

Co-Authored-By: Acid Chicken (硫酸鶏) <root@acid-chicken.com>

* Add newline at the end of file

* Fix stray newline in promise chain

* Ignore var in try{}catch(){} block

Co-Authored-By: Acid Chicken (硫酸鶏) <root@acid-chicken.com>

* Add missing comma

* Add missing semicolon

* Support more attestation formats

* add support for more key types and linter pass

* Refactor

* Refactor

* credentialId --> id

* Fix

* Improve readability

* Add indexes

* fixes for credentialId->id

* Avoid changing store state

* Fix syntax error and code style

* Remove unused import

* Refactor of getkey API

* Create 1561706992953-webauthn.ts

* Update ja-JP.yml

* Add type annotations

* Fix code style

* Specify depedency version

* Fix code style

* Fix janitor daemon and login requesting 2FA regardless of status

src/daemons/janitor.ts

@@ -0,0 +1,18 @@
+const interval = 30 * 60 * 1000;
+import { AttestationChallenges } from '../models';
+import { LessThan } from 'typeorm';
+
+/**
+ * Clean up database occasionally
+ */
+export default function() {
+	async function tick() {
+		await AttestationChallenges.delete({
+			createdAt: LessThan(new Date(new Date().getTime() - 5 * 60 * 1000))
+		});
+	}
+
+	tick();
+
+	setInterval(tick, interval);
+}