/auto (#16696)

Add `/auto` behind a feature flag that's disabled for now, even for
staff.

We've decided on a different design for context inference, but there are
parts of /auto that will be useful for that, so we want them in the code
base even if they're unused for now.

Release Notes:

- N/A

---------

Co-authored-by: Antonio Scandurra <me@as-cii.com>
Co-authored-by: Marshall Bowers <elliott.codes@gmail.com>

crates/http_client/src/http_client.rs

@@ -221,6 +221,10 @@ impl HttpClient for HttpClientWithUrl {
 
 pub fn client(user_agent: Option<String>, proxy: Option<Uri>) -> Arc<dyn HttpClient> {
     let mut builder = isahc::HttpClient::builder()
+        // Some requests to Qwen2 models on Runpod can take 32+ seconds,
+        // especially if there's a cold boot involved. We may need to have
+        // those requests use a different http client, because global timeouts
+        // of 50 and 60 seconds, respectively, would be very high!
         .connect_timeout(Duration::from_secs(5))
         .low_speed_timeout(100, Duration::from_secs(5))
         .proxy(proxy.clone());