ContainerizationExtras: Timeout adjustments (#254)

Three things:

1. Timeout.run today didn't allow a throwing closure.
2. Add a new constructor for Timeout that takes in a Duration directly
so we can be more granular than seconds.
3. Add unit tests because we all love those :)

Sources/ContainerizationExtras/Timeout.swift

@@ -23,11 +23,11 @@ public struct Timeout {
     /// doesn't finish in the provided `seconds` amount.
     public static func run<T: Sendable>(
         seconds: UInt32,
-        operation: @escaping @Sendable () async -> T
+        operation: @escaping @Sendable () async throws -> T
     ) async throws -> T {
         try await withThrowingTaskGroup(of: T.self) { group in
             group.addTask {
-                await operation()
+                try await operation()
             }
 
             group.addTask {
@@ -43,4 +43,27 @@ public struct Timeout {
             return result
         }
     }
+
+    public static func run<T: Sendable>(
+        for duration: Duration,
+        operation: @escaping @Sendable () async throws -> T
+    ) async throws -> T {
+        try await withThrowingTaskGroup(of: T.self) { group in
+            group.addTask {
+                try await operation()
+            }
+
+            group.addTask {
+                try await Task.sleep(for: duration)
+                throw CancellationError()
+            }
+
+            guard let result = try await group.next() else {
+                fatalError()
+            }
+
+            group.cancelAll()
+            return result
+        }
+    }
 }