Support Wasi as target (#216)

* Improve features
* Add wasm32-wasi as a target
* Update .github/workflows/ci.yml
Co-authored-by: morenol <22335041+morenol@users.noreply.github.com>

src/preprocessing/numerical.rs

@@ -420,7 +420,10 @@ mod tests {
 
         /// Same as `fit_for_random_values` test, but using a `StandardScaler` that has been
         /// serialized and deserialized.
-        #[cfg_attr(target_arch = "wasm32", wasm_bindgen_test::wasm_bindgen_test)]
+        #[cfg_attr(
+            all(target_arch = "wasm32", not(target_os = "wasi")),
+            wasm_bindgen_test::wasm_bindgen_test
+        )]
         #[test]
         #[cfg(feature = "serde")]
         fn serde_fit_for_random_values() {