Code review feedback.

* Move `Module::compile` to `Engine::precompile_module`.
* Remove `Module::deserialize` method.
* Make `Module::serialize` the same format as `Engine::precompile_module`.
* Make `Engine::precompile_module` return a `Vec<u8>`.
* Move the remaining serialization-related code to `serialization.rs`.

crates/c-api/src/module.rs

@@ -185,13 +185,10 @@ pub extern "C" fn wasmtime_module_deserialize(
     binary: &wasm_byte_vec_t,
     ret: &mut *mut wasm_module_t,
 ) -> Option<Box<wasmtime_error_t>> {
-    handle_result(
-        Module::deserialize(&engine.engine, binary.as_slice()),
-        |module| {
-            let module = Box::new(wasm_module_t::new(module));
-            *ret = Box::into_raw(module);
-        },
-    )
+    handle_result(Module::new(&engine.engine, binary.as_slice()), |module| {
+        let module = Box::new(wasm_module_t::new(module));
+        *ret = Box::into_raw(module);
+    })
 }
 
 #[no_mangle]