feat: add phase 3 bun_binary bootstrap and tests

tests/binary_test/run_binary.sh

@@ -0,0 +1,11 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+binary="$1"
+expected="$2"
+output="$(${binary})"
+
+if [[ "${output}" != "${expected}" ]]; then
+  echo "Unexpected output from ${binary}: ${output}" >&2
+  exit 1
+fi