Fix Sse client api (#6685)

* Use reqwest eventsource for get_events api

* await for Event::Open before returning stream

* fmt

* Merge branch 'unstable' into sse-client-fix

* Ignore lint

Cargo.lock

@@ -2576,6 +2576,7 @@ dependencies = [
  "proto_array",
  "psutil",
  "reqwest",
+ "reqwest-eventsource",
  "sensitive_url",
  "serde",
  "serde_json",
@@ -2977,6 +2978,17 @@ dependencies = [
  "pin-project-lite",
 ]
 
+[[package]]
+name = "eventsource-stream"
+version = "0.2.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "74fef4569247a5f429d9156b9d0a2599914385dd189c539334c625d8099d90ab"
+dependencies = [
+ "futures-core",
+ "nom",
+ "pin-project-lite",
+]
+
 [[package]]
 name = "execution_engine_integration"
 version = "0.1.0"
@@ -7179,6 +7191,22 @@ dependencies = [
  "winreg",
 ]
 
+[[package]]
+name = "reqwest-eventsource"
+version = "0.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f529a5ff327743addc322af460761dff5b50e0c826b9e6ac44c3195c50bb2026"
+dependencies = [
+ "eventsource-stream",
+ "futures-core",
+ "futures-timer",
+ "mime",
+ "nom",
+ "pin-project-lite",
+ "reqwest",
+ "thiserror 1.0.69",
+]
+
 [[package]]
 name = "resolv-conf"
 version = "0.7.0"