Metrics: vend counters as strings to avoid making SWBProtocol part of the public interface for SwiftBuild

Sources/SWBProtocol/BuildOperationMessages.swift

@@ -558,6 +558,10 @@ public struct BuildOperationMetrics: Equatable, Codable, Sendable {
     /// The key is the first component of task rule info, a.k.a. the rule info type
     public let taskCounters: [String: [TaskCounter: Int]]
 
+    public var isEmpty: Bool {
+        counters.isEmpty && taskCounters.isEmpty
+    }
+
     public init(counters: [Counter : Int], taskCounters: [String: [TaskCounter: Int]]) {
         self.counters = counters
         self.taskCounters = taskCounters

Sources/SwiftBuild/ConsoleCommands/SWBServiceConsoleBuildCommandProtocol.swift

@@ -14,7 +14,6 @@
 
 public import Foundation
 public import SWBProjectModel
-public import SWBProtocol
 
 import SWBUtil
 
@@ -169,10 +168,10 @@ public enum SwiftBuildMessage {
     }
 
     public struct BuildOperationMetrics {
-        let counters: [SWBProtocol.BuildOperationMetrics.Counter: Int]
+        public let counters: [String: Int]
 
         /// The key is the first component of task rule info, a.k.a. the rule info type
-        let taskCounters: [String: [SWBProtocol.BuildOperationMetrics.TaskCounter: Int]]
+        public let taskCounters: [String: [String: Int]]
     }
 
     public struct BuildCompletedInfo {

Sources/SwiftBuild/SWBuildMessage+Protocol.swift

@@ -47,8 +47,11 @@ extension SwiftBuildMessage {
 
     init(_ message: BuildOperationEnded) {
         let metrics: BuildOperationMetrics?
-        if let messageMetrics = message.metrics, !messageMetrics.counters.isEmpty {
-            metrics = .init(counters: messageMetrics.counters, taskCounters: messageMetrics.taskCounters)
+        if let messageMetrics = message.metrics, !messageMetrics.isEmpty {
+            metrics = .init(
+                counters: Dictionary(uniqueKeysWithValues: messageMetrics.counters.map { ($0.key.rawValue, $0.value) }),
+                taskCounters: messageMetrics.taskCounters.mapValues { Dictionary(uniqueKeysWithValues: $0.map { ($0.key.rawValue, $0.value) }) }
+            )
         } else {
             metrics = nil
         }