Add example wasm component and runner which embeds the component

runner/Cargo.toml

@@ -0,0 +1,7 @@
+[package]
+name = "wasmtime-test"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+wasmtime = {version = "20.0.2", features = ["component-model"]}

runner/src/main.rs

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+use wasmtime::{
+    component::{bindgen, Component, Linker},
+    Config, Engine, Store,
+};
+
+// Defaults to 'wit' folder adjacent to cargo.toml.
+// Change folder by using: bindgen!(in "other/with/folder")
+bindgen!();
+
+struct TestState {
+    name: String,
+}
+
+impl TestImports for TestState {
+    fn hello(&mut self) -> std::result::Result<(), wasmtime::Error> {
+        println!("{}", self.name);
+        Ok(())
+    }
+}
+
+fn main() -> wasmtime::Result<()> {
+    let mut config = Config::new();
+    config.wasm_component_model(true);
+    let engine = Engine::new(&config)?;
+    let component = Component::from_file(&engine, "target/wasm32-wasi/release/component.wasm")?;
+    let mut linker = Linker::new(&engine);
+    Test::add_to_linker(&mut linker, |state: &mut TestState| state)?;
+    let mut store = Store::new(
+        &engine,
+        TestState {
+            name: "Hello World".to_string(),
+        },
+    );
+    let (bindings, _) = Test::instantiate(&mut store, &component, &linker)?;
+    bindings.call_greet(&mut store)?;
+    Ok(())
+}

runner/wit/test.wit

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+package my:project;
+
+world test {
+    import hello: func();
+    export greet: func();
+}