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>

1 files changed, 20 insertions, 0 deletions

diff --git a/tests/specs/npm/node_modules_dir_yargs/cjs_yargs/main.js b/tests/specs/npm/node_modules_dir_yargs/cjs_yargs/main.js
new file mode 100644
index 000000000..832fd053c
--- /dev/null
+++ b/tests/specs/npm/node_modules_dir_yargs/cjs_yargs/main.js
@@ -0,0 +1,20 @@
+import yargs from "npm:yargs@15.4.1";
+
+const args = yargs(["serve", "8000"])
+  .command("serve [port]", "start the server", (yargs) => {
+    return yargs
+      .positional("port", {
+        describe: "port to bind on",
+        default: 5000,
+      });
+  }, (argv) => {
+    console.info(`start server on :${argv.port}`);
+  })
+  .option("verbose", {
+    alias: "v",
+    type: "boolean",
+    description: "Run with verbose logging",
+  })
+  .argv;
+
+console.log(args);