properly re-export handler definitions

Author: Robbepop

crates/wasmi/src/engine/executor/handler/mod.rs

@@ -5,3 +5,8 @@ mod eval;
 mod utils;
 mod exec;
 mod state;
+
+pub use self::{
+    dispatch::{init_wasm_func_call, op_code_to_handler},
+    state::Stack,
+};