chore: Move to Typescript (#2783)

This PR moves the entire project to Typescript. Due to the ~1000 ignores this will lead to a messy codebase for a while, but the churn is worth it – all of those ignore comments are places that were never type-safe previously.

closes #1282

shared/embeds/Gist.test.ts

@@ -0,0 +1,27 @@
+import Gist from "./Gist";
+
+describe("Gist", () => {
+  const match = Gist.ENABLED[0];
+
+  test("to be enabled on gist link", () => {
+    expect(
+      "https://gist.github.com/wmertens/0b4fd66ca7055fd290ecc4b9d95271a9".match(
+        match
+      )
+    ).toBeTruthy();
+    expect(
+      "https://gist.github.com/n3n/eb51ada6308b539d388c8ff97711adfa".match(
+        match
+      )
+    ).toBeTruthy();
+    expect(
+      "https://gist.github.com/ShubhanjanMedhi-dev/900c9c14093611898a4a085938bb90d9".match(
+        match
+      )
+    ).toBeTruthy();
+  });
+
+  test("to not be enabled elsewhere", () => {
+    expect("https://gist.github.com/tommoor".match(match)).toBe(null);
+  });
+});