Add create and drop benchmark (#183)

Signed-off-by: Adam Fowler <[email protected]>

Author: adam-fowler

Benchmarks/ValkeyBenchmarks/ValkeyConnectionBenchmark.swift

@@ -21,10 +21,37 @@ import Valkey
 
 @available(valkeySwift 1.0, *)
 func connectionBenchmarks() {
+    makeConnectionCreateAndDropBenchmark()
     makeConnectionGETBenchmark()
     makeConnectionPipelineBenchmark()
 }
 
+@available(valkeySwift 1.0, *)
+@discardableResult
+func makeConnectionCreateAndDropBenchmark() -> Benchmark? {
+    let serverMutex = Mutex<(any Channel)?>(nil)
+
+    return Benchmark("Connection: Create and drop benchmark", configuration: .init(metrics: defaultMetrics, scalingFactor: .kilo)) { benchmark in
+        let port = serverMutex.withLock { $0 }!.localAddress!.port!
+        let logger = Logger(label: "test")
+        benchmark.startMeasurement()
+        for _ in benchmark.scaledIterations {
+            try await ValkeyConnection.withConnection(
+                address: .hostname("127.0.0.1", port: port),
+                configuration: .init(),
+                logger: logger
+            ) { _ in
+            }
+        }
+        benchmark.stopMeasurement()
+    } setup: {
+        let server = try await makeLocalServer()
+        serverMutex.withLock { $0 = server }
+    } teardown: {
+        try await serverMutex.withLock { $0 }?.close().get()
+    }
+}
+
 @available(valkeySwift 1.0, *)
 @discardableResult
 func makeConnectionGETBenchmark() -> Benchmark? {