✨ 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/utils/fn.ts

@@ -0,0 +1,13 @@
+import { ZodSchema, z } from "zod";
+
+export function fn<
+    Arg1 extends ZodSchema,
+    Callback extends (arg1: z.output<Arg1>) => any,
+>(arg1: Arg1, cb: Callback) {
+    const result = function (input: z.input<typeof arg1>): ReturnType<Callback> {
+        const parsed = arg1.parse(input);
+        return cb.apply(cb, [parsed as any]);
+    };
+    result.schema = arg1;
+    return result;
+}

packages/core/src/utils/index.ts

@@ -0,0 +1 @@
+export * from "./fn"