✨ feat: Add auth flow (#146)

This adds a simple way to incorporate a centralized authentication flow.

The idea is to have the user, API and SSH (for machine authentication)
all in one place using `openauthjs` + `SST`

We also have a database now :)

> We are using InstantDB as it allows us to authenticate a use with just
the email. Plus it is super simple simple to use _of course after the
initial fumbles trying to design the db and relationships_

packages/core/src/context.ts

@@ -0,0 +1,17 @@
+import { AsyncLocalStorage } from "node:async_hooks";
+
+export function createContext<T>() {
+  const storage = new AsyncLocalStorage<T>();
+  return {
+    use() {
+      const result = storage.getStore();
+      if (!result) {
+        throw new Error("No context available");
+      }
+      return result;
+    },
+    with<R>(value: T, fn: () => R) {
+      return storage.run<R>(value, fn);
+    },
+  };
+}