[script] Add yarn generate-changelog (#34962)

(disclaimer: I used codex to write this script)

Adds a new `yarn generate-changelog` script to simplify the process of
writing changelogs. You can use it as follows:

```
$ yarn generate-changelog --help

Usage: yarn generate-changelog [--codex|--claude] [--debug] [<pkg@version> ...]

Options:
  --codex     Use Codex for commit summarization.                      [boolean]
  --claude    Use Claude for commit summarization.                     [boolean]
  --debug     Enable verbose debug logging.           [boolean] [default: false]
  -h, --help  Show help                                                [boolean]

Examples:
  generate-changelog --codex                Generate changelog for a single
  [email protected]           package using Codex.
  generate-changelog --claude [email protected]    Generate changelog entries for
  [email protected]                            multiple packages using Claude.
  generate-changelog --codex                Generate changelog for all stable
                                            packages using recorded versions.
```

For example, if no args are passed, the script will print find all the
relevant commits affecting packages (defaults to `stablePackages` in
`ReactVersions.js`) and format them as a simple markdown list.

```
$ yarn generate-changelog

## [email protected]
* [compiler] improve zod v3 backwards compat (#34877) ([#34877](https://github.com/facebook/react/pull/34877) by [@henryqdineen](https://github.com/henryqdineen))
* [ESLint] Disallow passing effect event down when inlined as a prop (#34820) ([#34820](https://github.com/facebook/react/pull/34820) by [@jf-eirinha](https://github.com/jf-eirinha))
* Switch to `export =` to fix eslint-plugin-react-hooks types (#34949) ([#34949](https://github.com/facebook/react/pull/34949) by [@karlhorky](https://github.com/karlhorky))
* [eprh] Type `configs.flat` more strictly (#34950) ([#34950](https://github.com/facebook/react/pull/34950) by [@poteto](https://github.com/poteto))
* Add hint for Node.js cjs-module-lexer for eslint-plugin-react-hook types (#34951) ([#34951](https://github.com/facebook/react/pull/34951) by [@karlhorky](https://github.com/karlhorky))
* Add hint for Node.js cjs-module-lexer for eslint-plugin-react-hook types (#34953) ([#34953](https://github.com/facebook/react/pull/34953) by [@karlhorky](https://github.com/karlhorky))

// etc etc...
```

If `--codex` or `--claude` is passed, the script will attempt to use
them to summarize the commit(s) in the same style as our existing
CHANGELOG.md.

And finally, for debugging the script you can add `--debug` to see
what's going on.