Channing Conger 4e59ceae06 Add feature for optional request compression (#8767) ...

Adds a new feature
`enable_request_compression` that will compress using zstd requests to
the codex-backend. Currently only enabled for codex-backend so only enabled for openai providers when using chatgpt::auth even when the feature is enabled

Added a new info log line too for evaluating the compression ratio and
overhead off compressing before requesting. You can enable with
`RUST_LOG=$RUST_LOG,codex_client::transport=info`

```
2026-01-06T00:09:48.272113Z  INFO codex_client::transport: Compressed request body with zstd pre_compression_bytes=28914 post_compression_bytes=11485 compression_duration_ms=0
```

2026-01-09 11:37:11 +00:00

..

clients.rs

Add feature for optional request compression (#8767)

2026-01-09 11:37:11 +00:00

models_integration.rs

Merge Modelfamily into modelinfo (#8763)

2026-01-09 11:37:08 +00:00

sse_end_to_end.rs

Add feature for optional request compression (#8767)

2026-01-09 11:37:11 +00:00