Refactoring work to support multi-tenancy and multiple storage, database backends (#598)

* Backend infrastructure
* New backend configuration work
* Factor out KV prefixing
* Don't put assets in the manifest cache
* Removed fancy authentication stuff
* Documentation updates

plugos/lib/datastore.test.ts

@@ -2,11 +2,11 @@ import "https://esm.sh/fake-indexeddb@4.0.2/auto";
 import { IndexedDBKvPrimitives } from "./indexeddb_kv_primitives.ts";
 import { DataStore } from "./datastore.ts";
 import { DenoKvPrimitives } from "./deno_kv_primitives.ts";
-import { KvPrimitives } from "./kv_primitives.ts";
+import { KvPrimitives, PrefixedKvPrimitives } from "./kv_primitives.ts";
 import { assertEquals } from "https://deno.land/std@0.165.0/testing/asserts.ts";
 
 async function test(db: KvPrimitives) {
-  const datastore = new DataStore(db, ["ds"], {
+  const datastore = new DataStore(new PrefixedKvPrimitives(db, ["ds"]), {
     count: (arr: any[]) => arr.length,
   });
   await datastore.set(["user", "peter"], { name: "Peter" });