+ convenience APIs since most people will never use the underlying current value (#27)

Author: ktoso

Sources/InstrumentationBaggage/Baggage.swift

@@ -236,5 +236,23 @@ extension Baggage {
     /// A `Baggage` automatically propagated through task-local storage. This API enables binding a top-level `Baggage` and passing it
     /// implicitly to any child tasks when using structured concurrency.
     @TaskLocal public static var current: Baggage?
+
+    /// Convenience API to bind the task-local ``Baggage/current`` to the passed `value`, and execute the passed `operation`.
+    ///
+    /// To access the task-local value, use `Baggage.current`.
+    ///
+    /// SeeAlso: [Swift Task Locals](https://developer.apple.com/documentation/swift/tasklocal)
+    func withValue<T>(_ value: Baggage?, operation: () throws -> T) rethrows -> T {
+        try Baggage.$current.withValue(value, operation: operation)
+    }
+
+    /// Convenience API to bind the task-local ``Baggage/current`` to the passed `value`, and execute the passed `operation`.
+    ///
+    /// To access the task-local value, use `Baggage.current`.
+    ///
+    /// SeeAlso: [Swift Task Locals](https://developer.apple.com/documentation/swift/tasklocal)
+    func withValue<T>(_ value: Baggage?, operation: () async throws -> T) async rethrows -> T {
+        try await Baggage.$current.withValue(value, operation: operation)
+    }
 }
 #endif