Work on macro binding generation, some cleanup needed, rename runner to plugin

crates/plugin_runtime/plugin/cargo_test/src/main.rs

@@ -0,0 +1,34 @@
+use core::slice;
+use plugin::prelude::*;
+
+#[no_mangle]
+pub extern "C" fn banana(ptr: *const u8, len: usize) -> *const Buffer {
+    // setup
+    let buffer = Buffer { ptr, len };
+    let data = unsafe { buffer.to_vec() };
+    // operation
+    // let reversed: Vec<u8> = data.into_iter().rev().collect();
+    let number: f64 = bincode::deserialize(&data).unwrap();
+    let new_number = number * 2.0;
+    let new_data = bincode::serialize(&new_number).unwrap();
+    // teardown
+    let new_buffer = unsafe { Buffer::from_vec(new_data) };
+    return new_buffer.leak_to_heap();
+}
+
+pub fn banana2(number: f64) -> f64 {
+    number * 2.0
+}
+
+#[bind]
+pub fn sum_lengths(strings: Vec<String>) -> usize {
+    let mut total = 0;
+    for string in strings {
+        total += string.len();
+    }
+    return total;
+}
+
+pub fn main() -> () {
+    ()
+}