Enabling Azure Foundry model deployments for codex-cli

[avberaMS2]

We can use any api-key based foundry model deployments to run codex-cli

Verified against o3, o4-mini, o3-mini azure foundry deployments

Use codex-cli/test_azure.bat to run codex-cli

[github-actions]

All contributors have signed the CLA ✍️ ✅
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[avberaMS2]

I have read the CLA Document and I hereby sign the CLA

[bolinfest]

Now that we have moved to the Rust CLI for releases, we are not considering major changes to the TypeScript codebase.

For the Rust CLI, we are not baking in third-party providers like we were in the TypeScript CLI. If providers need special behavior, it must be done via configuration.

That said, I believe I added a comparable feature for the openai provider in #1487. So if you put together a PR that added a config option like base_url_env_var that takes a string to indicate an environment variable such that:

• if the corresponding env var exists and is non-empty, then its value is used as base_url
• otherwise it falls back to base_url

If base_url is empty, then the request fails.

This would also require updating the docs in config.md.