Adding Timer.record(_ duration: Duration)

Motivation:

`Duration` is available starting Swift 5.7, and we
should probably support it in our convinience API.

Modifications:

This commit adds:
- Timer.record(_ duration: Duration) implementation
- A unit test case
- Generated Linux tests

Sources/Metrics/Metrics.swift

@@ -74,3 +74,16 @@ extension Timer {
         }
     }
 }
+
+extension Timer {
+    /// Convenience for recording a duration based on ``Duration``.
+    ///
+    /// - parameters:
+    ///     - duration: The duration to record.
+    @available(macOS 13, iOS 16, tvOS 15, watchOS 8, *)
+    @inlinable
+    public func record(_ duration: Duration) {
+        let durationSeconds = Double(duration.components.seconds) + Double(duration.components.attoseconds) / 1e18
+        self.recordSeconds(durationSeconds)
+    }
+}

Tests/MetricsTests/MetricsTests+XCTest.swift

@@ -29,6 +29,7 @@ extension MetricsExtensionsTests {
             ("testTimerWithTimeInterval", testTimerWithTimeInterval),
             ("testTimerWithDispatchTime", testTimerWithDispatchTime),
             ("testTimerWithDispatchTimeInterval", testTimerWithDispatchTimeInterval),
+            ("testTimerDuration", testTimerDuration),
             ("testTimerUnits", testTimerUnits),
             ("testPreferDisplayUnit", testPreferDisplayUnit),
         ]

Tests/MetricsTests/MetricsTests.swift

@@ -95,6 +95,28 @@ class MetricsExtensionsTests: XCTestCase {
         XCTAssertEqual(UInt64(testTimer.values.first!), end.uptimeNanoseconds - start.uptimeNanoseconds, "expected value to match")
         XCTAssertEqual(metrics.timers.count, 1, "timer should have been stored")
     }
+    
+    func testTimerDuration() throws {
+        guard #available(iOS 16, macOS 13, tvOS 15, watchOS 8, *) else {
+            return
+        }
+        
+        let metrics = TestMetrics()
+        MetricsSystem.bootstrapInternal(metrics)
+        
+        let name = "timer-\(UUID().uuidString)"
+        let duration = Duration(secondsComponent: 3, attosecondsComponent: 123000000000000000)
+        let durationInNanoseconds = duration.components.seconds * 1_000_000_000 + duration.components.attoseconds / 1_000_000_000
+        
+        let timer = Timer(label: name)
+        timer.record(duration)
+        
+        let testTimer = try metrics.expectTimer(timer)
+        XCTAssertEqual(testTimer.values.count, 1, "expected number of entries to match")
+        XCTAssertEqual(testTimer.values.first, durationInNanoseconds, "expected value to match")
+        XCTAssertEqual(metrics.timers.count, 1, "timer should have been stored")
+    }
+    
 
     func testTimerUnits() throws {
         let metrics = TestMetrics()