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

server/scripts/bootstrap.ts

@@ -0,0 +1,11 @@
+if (process.env.NODE_ENV !== "test") {
+  // eslint-disable-next-line @typescript-eslint/no-var-requires
+  require("dotenv").config({
+    silent: true,
+  });
+}
+
+// @ts-expect-error ts-migrate(2322) FIXME: Type 'true' is not assignable to type 'string | un... Remove this comment to see the full error message
+process.env.SINGLE_RUN = true;
+
+export {};