feat(cross-platform): Improve Linux compatibility

Conditionally import FoundationNetworking and os.log to support non-Apple platforms.

Author: Šimon Šesták

Package.swift

@@ -1,4 +1,4 @@
-// swift-tools-version: 6.1.2
+// swift-tools-version: 6.1.0
 // The swift-tools-version declares the minimum version of Swift required to build this package.
 
 import PackageDescription

Sources/FTNetworkTracer/FTNetworkTracer.swift

@@ -1,4 +1,7 @@
 import Foundation
+#if canImport(FoundationNetworking)
+import FoundationNetworking
+#endif
 #if canImport(os.log)
 import os.log
 #endif

Sources/FTNetworkTracer/Logging/LogPrivacy.swift

@@ -25,6 +25,7 @@ public enum LogPrivacy: String, CaseIterable, Sendable {
     /// The default value is `.auto`.
     public static let `default`: LogPrivacy = .auto
 
+    #if canImport(os.log)
     var level: OSLogPrivacy {
         switch self {
         case .none:
@@ -37,4 +38,5 @@ public enum LogPrivacy: String, CaseIterable, Sendable {
             OSLogPrivacy.sensitive
         }
     }
+    #endif
 }