add a script to benchmark build times

script/bench_build.py

@@ -0,0 +1,19 @@
+import subprocess
+
+def run_build(crate):
+    subprocess.run(["touch", f"crates/{crate}/src/{crate}.rs"])
+    result = subprocess.run(["cargo", "build", "--timings"], capture_output=True, text=True)
+    output = result.stderr.splitlines()[-1].split(" ")[-1]
+    return float(output.rstrip('s'))
+
+def run_bench(crate, n = 5):
+    results = []
+    for i in range(n):
+        results.append(run_build(crate))
+        print(f"Run {i+1}/{n} took {results[-1]} seconds")
+
+    average = sum(results) / len(results)
+    print(f"Average build time: {average:.2f} seconds")
+    return average
+
+run_bench("project")