No more picking out version numbers by hand! Now we let the script do
it:
```
$ ./codex-rs/scripts/create_github_release --dry-run --publish-alpha
Running gh api GET /repos/openai/codex/releases/latest
Running gh api GET /repos/openai/codex/releases?per_page=100
Publishing version 0.31.0-alpha.3
$ ./codex-rs/scripts/create_github_release --dry-run --publish-release
Running gh api GET /repos/openai/codex/releases/latest
Publishing version 0.31.0
```
---
[//]: # (BEGIN SAPLING FOOTER)
Stack created with [Sapling](https://sapling-scm.com). Best reviewed
with [ReviewStack](https://reviewstack.dev/openai/codex/pull/3230).
* __->__ #3231
* #3230
* #3228
* #3226
This improves the release process by introducing
`scripts/publish_to_npm.py` to automate publishing to npm (modulo the
human 2fac step).
As part of this, it updates `.github/workflows/rust-release.yml` to
create the artifact for npm using `npm pack`.
And finally, while it is long overdue, this memorializes the release
process in `docs/release_management.md`.