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, 12 insertions, 0 deletions

diff --git a/tests/specs/npm/cjs_with_deps/cjs_with_deps/main.js b/tests/specs/npm/cjs_with_deps/cjs_with_deps/main.js
new file mode 100644
index 000000000..568726874
--- /dev/null
+++ b/tests/specs/npm/cjs_with_deps/cjs_with_deps/main.js
@@ -0,0 +1,12 @@
+import chalk from "npm:chalk@4";
+import { expect } from "npm:chai@4.3";
+
+console.log(chalk.green("chalk cjs loads"));
+
+const timeout = setTimeout(() => {}, 0);
+expect(timeout).to.be.a("number");
+clearTimeout(timeout);
+
+const interval = setInterval(() => {}, 100);
+expect(interval).to.be.a("number");
+clearInterval(interval);