Add "bedtools map" with a new group_by logic

build.rs

@@ -0,0 +1,8 @@
+fn main() {
+    // Use pyo3-build-config to get the Python interpreter's configuration,
+    // then emit an rpath so the test/binary can find libpython at runtime on macOS.
+    let config = pyo3_build_config::get();
+    if let Some(lib_dir) = &config.lib_dir {
+        println!("cargo:rustc-link-arg=-Wl,-rpath,{}", lib_dir);
+    }
+}