Split the frida handler to a separte handler and add a test

tests/mylib/Cargo.lock

@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "mylib"
+version = "0.1.0"

tests/mylib/Cargo.toml

@@ -0,0 +1,9 @@
+[package]
+name = "mylib"
+version = "0.1.0"
+edition = "2021"
+
+[lib]
+crate-type = ["cdylib"]
+
+[dependencies]

tests/mylib/src/lib.rs

@@ -0,0 +1,4 @@
+#[no_mangle]
+pub extern "C" fn mylib_foo() -> u8 {
+	10
+}