Enable all Wasm features in Validator

fix #145

Enable all Wasm features in the `Validator` so we can use components
that rely on Wasm features that isn't enabled by default, such as `gc`.

crates/wac-graph/src/graph.rs

@@ -1225,10 +1225,7 @@ impl CompositionGraph {
         let bytes = CompositionGraphEncoder::new(self).encode(options)?;
 
         if options.validate {
-            Validator::new_with_features(WasmFeatures {
-                component_model: true,
-                ..Default::default()
-            })
+            Validator::new_with_features(WasmFeatures::all())
             .validate_all(&bytes)
             .map_err(|e| EncodeError::ValidationFailure { source: e })?;
         }

crates/wac-types/src/package.rs

@@ -200,10 +200,7 @@ impl Package {
 
         let mut parser = Parser::new(0);
         let mut parsers = Vec::new();
-        let mut validator = Validator::new_with_features(WasmFeatures {
-            component_model: true,
-            ..Default::default()
-        });
+        let mut validator = Validator::new_with_features(WasmFeatures::all());
         let mut imports = Vec::new();
         let mut exports = Vec::new();