feat: support spinning up in-memory mongo server for local development

.gitignore

@@ -0,0 +1 @@
+__hyper__

README.md

@@ -49,12 +49,44 @@ export default {
 create `mod.js`
 
 ```js
-import core from 'https://raw.githubusercontent.com/hyper63/hyper/hyper%40v4.1.0/packages/core/mod.ts'
+import core from 'https://raw.githubusercontent.com/hyper63/hyper/hyper%40v4.3.2/packages/core/mod.ts'
 import config from './hyper.config.js'
 
 core(config)
 ```
 
+### MongoDB In-Memory
+
+This adapter supports dynamically starting a local MongoDB server, running in memory. This is a
+great option for running a hyper Server locally, without needing to also spin up MongoDB locally
+(this what [hyper-nano](https://github.com/hyper63/hyper/tree/main/images/nano) is doing underneath
+the hood).
+
+To start a local MongoDB server, simply pass the `dir` option to the adapter. You can also specify
+`dirVersion` to specify the version of MongoDB to spin up locally.
+
+```js
+import { default as mongo } from 'https://raw.githubusercontent.com/hyper63/hyper-adapter-mongodb/{TAG}/mod.ts'
+
+export default {
+  app: express,
+  adapter: [
+    {
+      port: 'data',
+      plugins: [mongo({ dir: '__hyper__', dirVersion: '7.0.4' })],
+    },
+  ],
+}
+```
+
+The adapter will dynamically download the corresponding MongoDB binary, start it, then generate a
+connection string that the adapter will use to connect to it.
+
+> The MongoDB binary is downloaded and cached in `dir`, if it does not already exist. This may take
+> some time the first startup, but then is fast after caching. MongoDB data is stored in
+> `{dir}/data`. The binary plus the internal MongoDB data can typically require a non-trivial amount
+> of disk, around 500MB.
+
 ## Installation
 
 This is a Deno module available to import from Github via Git Tags

adapter.memory.test.ts

@@ -0,0 +1,22 @@
+import mongo from './mod.ts'
+
+import { suite } from './test/suite.ts'
+
+Deno.test({
+  name: 'Mongo Adapter Test Suite - In-Memory',
+  fn: async (t) => {
+    const { client } = await mongo({ dir: '__hyper__', dirVersion: '7.0.4' }).load()
+    await suite(t)(client, { shouldBaseLine: true })
+  },
+  /**
+   * The native client maintains TCP connections
+   * and timers, as part of connecting to Mongo,
+   *
+   * So we ignore sanitization of these resources
+   * and ops, when running tests with the NativeClient
+   *
+   * See https://deno.com/manual/basics/testing/sanitizers
+   */
+  sanitizeOps: false,
+  sanitizeResources: false,
+})

adapter.native.integration.test.ts

@@ -1,4 +1,4 @@
-import { NativeClient } from './clients/native.ts'
+import mongo from './mod.ts'
 
 import { suite } from './test/suite.ts'
 
@@ -10,7 +10,7 @@ Deno.test({
       throw new Error('MongoDB connection string is required at MONGO_URL')
     }
 
-    const client = new NativeClient({ url })
+    const { client } = await mongo({ url }).load()
     await suite(t)(client, { shouldBaseLine: true })
   },
   /**