feat: add `--allow-import` flag (#25469)

This replaces `--allow-net` for import permissions and makes the
security sandbox stricter by also checking permissions for statically
analyzable imports.

By default, this has a value of
`--allow-import=deno.land:443,jsr.io:443,esm.sh:443,raw.githubusercontent.com:443,gist.githubusercontent.com:443`,
but that can be overridden by providing a different set of hosts.

Additionally, when no value is provided, import permissions are inferred
from the CLI arguments so the following works because
`fresh.deno.dev:443` will be added to the list of allowed imports:

```ts
deno run -A -r https://fresh.deno.dev
```

---------

Co-authored-by: David Sherret <dsherret@gmail.com>

3 files changed, 17 insertions, 0 deletions

diff --git a/tests/specs/npm/sub_paths/__test__.jsonc b/tests/specs/npm/sub_paths/__test__.jsonc
new file mode 100644
index 000000000..88ccbc3ac
--- /dev/null
+++ b/tests/specs/npm/sub_paths/__test__.jsonc
@@ -0,0 +1,8 @@
+{
+  "args": "run -A --quiet sub_paths/main.jsx",
+  "output": "sub_paths/main.out",
+  "envs": {
+    "NO_COLOR": "1",
+    "NPM_CONFIG_REGISTRY": "http://localhost:4260/"
+  }
+}
diff --git a/tests/specs/npm/sub_paths/sub_paths/main.jsx b/tests/specs/npm/sub_paths/sub_paths/main.jsx
new file mode 100644
index 000000000..0c712b9ff
--- /dev/null
+++ b/tests/specs/npm/sub_paths/sub_paths/main.jsx
@@ -0,0 +1,8 @@
+import React from "npm:react@18.2.0";
+import { renderToString } from "npm:react-dom@18.2.0/server";
+
+function App({ name }) {
+  return <div>Hello {name}!</div>;
+}
+
+console.log(renderToString(<App name="World" />));
diff --git a/tests/specs/npm/sub_paths/sub_paths/main.out b/tests/specs/npm/sub_paths/sub_paths/main.out
new file mode 100644
index 000000000..f034585a7
--- /dev/null
+++ b/tests/specs/npm/sub_paths/sub_paths/main.out
@@ -0,0 +1 @@
+<div>Hello <!-- -->World<!-- -->!</div>