[feat] Allow CLI to generate import map that bundles subdependencies

[effulgentsia]

deno run -A -r https://esm.sh init
deno task esm:add react:preact/compat @radix-ui/react-slot

results in a deno.json file containing:

  "imports": {
    "@radix-ui/react-slot": "https://esm.sh/v135/*@radix-ui/[email protected]",
    "react": "https://esm.sh/v135/[email protected]/compat"
  },
  "scopes": {
    "https://esm.sh/v135/": {
      "@radix-ui/react-compose-refs": "https://esm.sh/v135/@radix-ui/[email protected]"
    }
  }

The * in the first line means that everything imported by react-slot is externalized. What I would like instead is:

  "imports": {
    "@radix-ui/react-slot": "https://esm.sh/v135/@radix-ui/[email protected]&bundle-deps&external=react",
    "react": "https://esm.sh/v135/[email protected]/compat"
  },

So that react is externalized from react-slot but other dependencies are bundled.

More generically, if I run deno task esm:add a b c, I want:

  "imports": {
    "a": "https://esm.sh/v135/a@[VERSION]&bundle-deps&external=b,c",
    "b": "https://esm.sh/v135/b@[VERSION]&bundle-deps&external=a,c",
    "c": "https://esm.sh/v135/c@[VERSION]&bundle-deps&external=a,b"    
  },

Is there configuration or command options that already allow this? If not, would there be interest in a PR that adds that?