✨ 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/functions/src/subjects.ts

@@ -0,0 +1,13 @@
+import * as v from "valibot"
+import { createSubjects } from "@openauthjs/openauth"
+
+export const subjects = createSubjects({
+  user: v.object({
+    accessToken: v.string(),
+    userID: v.string(),
+  }),
+  device: v.object({
+    fingerprint: v.string(),
+    id: v.string()
+  })
+})