chore: Make LogAgent conform to Sendable (#917)

* Make LogAgent conform to Sendable. This makes SwiftLogger Sendable.

* Mark test loggers with @unchecked Sendable.

---------

Co-authored-by: Sichan Yoo <[email protected]>

Author: sichanyoo

Sources/Smithy/Logging/LogAgent.swift

@@ -5,7 +5,7 @@
 // SPDX-License-Identifier: Apache-2.0
 //
 
-public protocol LogAgent {
+public protocol LogAgent: Sendable {
     /// name of the struct or class where the logger was instantiated from
     var name: String { get }
 

Sources/Smithy/Logging/LogAgentLevel.swift

@@ -8,7 +8,7 @@
 import Logging
 
 /// Wrapper for Logger.Level; used by LogAgent and SwiftLogger.
-public enum LogAgentLevel: String, Codable, CaseIterable {
+public enum LogAgentLevel: String, Codable, CaseIterable, Sendable {
     case trace
     case debug
     case info

Tests/ClientRuntimeTests/NetworkingTests/URLSession/FoundationStreamBridgeTests.swift

@@ -104,7 +104,7 @@ class FoundationStreamBridgeTests: XCTestCase {
     }
 }
 
-private class TestLogger: LogAgent {
+private class TestLogger: LogAgent, @unchecked Sendable {
     var name: String
 
     var messages: [(level: LogAgentLevel, message: String)] = []

Tests/ClientRuntimeTests/OrchestratorTests/OrchestratorTests.swift

@@ -58,7 +58,7 @@ class OrchestratorTests: XCTestCase {
         }
     }
 
-    class TraceLogger: LogAgent {
+    class TraceLogger: LogAgent, @unchecked Sendable {
         var trace: Trace = Trace()
         var name: String = "TestTraceLogger"
         var level: LogAgentLevel = .debug