missing headers_received signal in TraceConfig

### Is your feature request related to a problem?

aiohttp's [client tracing][1] docs state the request flow has a stage named `headers_received`. I suppose this means response headers received. But `TraceConfig` has no declared signal handler for it.

### Describe the solution you'd like

Tracing when response headers are received is usefull for early request time measuring. A new signal should be added at `TraceConfig.on_response_headers_received`.

### Describe alternatives you've considered

None

### Related component

Client

### Additional context

_No response_

### Code of Conduct

- [X] I agree to follow the aio-libs Code of Conduct

[1]: https://docs.aiohttp.org/en/stable/tracing_reference.html