There was a bit of copypasta I put up with when were publishing two
packages to npm, but now that it's three, I created some more scripts to
consolidate things.
With this change, I ran:
```shell
./scripts/stage_npm_packages.py --release-version 0.43.0-alpha.8 --package codex --package codex-responses-api-proxy --package codex-sdk
```
Indeed when it finished, I ended up with:
```shell
$ tree dist
dist
└── npm
├── codex-npm-0.43.0-alpha.8.tgz
├── codex-responses-api-proxy-npm-0.43.0-alpha.8.tgz
└── codex-sdk-npm-0.43.0-alpha.8.tgz
$ tar tzvf dist/npm/codex-sdk-npm-0.43.0-alpha.8.tgz
-rwxr-xr-x 0 0 0 25476720 Oct 26 1985 package/vendor/aarch64-apple-darwin/codex/codex
-rwxr-xr-x 0 0 0 29871400 Oct 26 1985 package/vendor/aarch64-unknown-linux-musl/codex/codex
-rwxr-xr-x 0 0 0 28368096 Oct 26 1985 package/vendor/x86_64-apple-darwin/codex/codex
-rwxr-xr-x 0 0 0 36029472 Oct 26 1985 package/vendor/x86_64-unknown-linux-musl/codex/codex
-rw-r--r-- 0 0 0 10926 Oct 26 1985 package/LICENSE
-rw-r--r-- 0 0 0 30187520 Oct 26 1985 package/vendor/aarch64-pc-windows-msvc/codex/codex.exe
-rw-r--r-- 0 0 0 35277824 Oct 26 1985 package/vendor/x86_64-pc-windows-msvc/codex/codex.exe
-rw-r--r-- 0 0 0 4842 Oct 26 1985 package/dist/index.js
-rw-r--r-- 0 0 0 1347 Oct 26 1985 package/package.json
-rw-r--r-- 0 0 0 9867 Oct 26 1985 package/dist/index.js.map
-rw-r--r-- 0 0 0 12 Oct 26 1985 package/README.md
-rw-r--r-- 0 0 0 4287 Oct 26 1985 package/dist/index.d.ts
```
