New async runtime client (#348)

Author: fabianfett

Package.swift

@@ -23,7 +23,7 @@ let package = Package(
         .library(name: "AWSLambdaTesting", targets: ["AWSLambdaTesting"]),
     ],
     dependencies: [
-        .package(url: "https://github.com/apple/swift-nio.git", .upToNextMajor(from: "2.67.0")),
+        .package(url: "https://github.com/apple/swift-nio.git", .upToNextMajor(from: "2.72.0")),
         .package(url: "https://github.com/apple/swift-log.git", .upToNextMajor(from: "1.5.4")),
         .package(url: "https://github.com/apple/swift-docc-plugin.git", from: "1.0.0"),
         .package(url: "https://github.com/apple/swift-testing.git", branch: "swift-DEVELOPMENT-SNAPSHOT-2024-08-29-a"),

Sources/AWSLambdaRuntimeCore/LambdaRuntimeClient.swift

@@ -142,8 +142,14 @@ extension LambdaRuntimeClient {
     static let defaultHeaders = HTTPHeaders([("user-agent", "Swift-Lambda/Unknown")])
 
     /// These headers must be sent along an invocation or initialization error report
-    static let errorHeaders = HTTPHeaders([
-        ("user-agent", "Swift-Lambda/Unknown"),
-        ("lambda-runtime-function-error-type", "Unhandled"),
-    ])
+    static let errorHeaders: HTTPHeaders = [
+        "user-agent": "Swift-Lambda/Unknown",
+        "lambda-runtime-function-error-type": "Unhandled",
+    ]
+
+    /// These headers must be sent along an invocation or initialization error report
+    static let streamingHeaders: HTTPHeaders = [
+        "user-agent": "Swift-Lambda/Unknown",
+        "transfer-encoding": "streaming",
+    ]
 }