[ENH]Added benchmarking tool for evaluating multithreading performance

aeon/testing/tests/benchmark_multithreading.py

@@ -0,0 +1,22 @@
+import timeit
+
+from joblib import Parallel, delayed
+
+
+def single_threaded_task(n):
+    return sum(i * i for i in range(n))
+
+
+def multi_threaded_task(n, n_jobs=4):
+    return Parallel(n_jobs=n_jobs)(
+        delayed(single_threaded_task)(n // n_jobs) for _ in range(n_jobs)
+    )
+
+
+# Benchmarking
+n = 10**6
+single_time = timeit.timeit(lambda: single_threaded_task(n), number=5)
+multi_time = timeit.timeit(lambda: multi_threaded_task(n), number=5)
+
+print(f"Single-threaded execution time: {single_time:.4f} seconds")
+print(f"Multi-threaded execution time: {multi_time:.4f} seconds")