refactor(tests): fix clippy warnings

tests/common/wasm.rs

@@ -0,0 +1,14 @@
+use captra::{HostState, add_wasm_linker_funcs};
+use wasmtime::{Engine, Linker, Store};
+
+/// Create a wasmtime engine + linker with your host functions registered,
+/// and a [`Store`] that owns the given [`HostState`].
+/// # Panics
+#[must_use]
+pub fn wasm_store_with_hosts(host: HostState) -> (Engine, Linker<HostState>, Store<HostState>) {
+    let engine = Engine::default();
+    let mut linker = Linker::new(&engine);
+    add_wasm_linker_funcs(&mut linker).expect("linker registration");
+    let store = Store::new(&engine, host);
+    (engine, linker, store)
+}