Add helper script for diagnosing any future leak issues

tools/debugger.entitlements

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+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "https://www.apple.com/DTDs/PropertyList-1.0.dtd"\>
+<plist version="1.0">
+    <dict>
+        <key>com.apple.security.get-task-allow</key>
+        <true/>
+    </dict>
+</plist>

tools/run_with_leaks.sh

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+#!/bin/bash
+set -euo pipefail
+
+# This script is a utility on Apple platforms to run one
+# of arboard's example binaries under the `leaks` CLI tool,
+# which can help to diagnose memory leakage in any kind of 
+# native or runtime-managed code.
+
+example_name="$@"
+
+script_dir=$(dirname $BASH_SOURCE[0])
+
+# Build the example
+cargo build --example "$example_name"
+
+# Sign it with the required entitlements for process debugging.
+codesign -s - -v -f --entitlements "$script_dir/debugger.entitlements" "./target/debug/examples/$example_name"
+
+# Run the example binary under `leaks` to look for any leaked objects.
+leaks --atExit -- "./target/debug/examples/$example_name"