feat: add env (#1157)

We frequently want to only run certain tests in certain environments so
we include `wherearewe`, `detect-node`, `is-electron` and other modules.

Ship a `/env` entrypoint to reduce the redundancy:

```js
import { isNode } from 'aegir/env'

if (isNode) {
  // do node things
}
```

Author: achingbrain

package.json

@@ -84,6 +84,10 @@
       "types": "./dist/utils/echo-server.d.ts",
       "import": "./utils/echo-server.js"
     },
+    "./env": {
+      "types": "./dist/src/env.d.ts",
+      "import": "./src/env.js"
+    },
     "./fixtures": {
       "types": "./dist/utils/fixtures.d.ts",
       "browser": "./utils/fixtures.browser.js",
@@ -310,6 +314,7 @@
     "uint8arrays": "^4.0.2",
     "undici": "^5.0.0",
     "update-notifier": "^6.0.2",
+    "wherearewe": "^2.0.1",
     "yargs": "^17.1.1",
     "yargs-parser": "^21.1.1"
   },

src/env.js

@@ -0,0 +1 @@
+export * from 'wherearewe'