feat<ci>: add a feature powerset check

.github/workflows/build.yml

@@ -88,6 +88,18 @@ jobs:
         command: test
         args: ${{matrix.flags}}
 
+  feature_powerset:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: dtolnay/rust-toolchain@v1
+        with:
+          toolchain: stable
+      - uses: taiki-e/install-action@v2
+        with:
+          tool: cargo-hack@0.5.25
+      - run: cargo hack check --feature-powerset --depth 2 --no-dev-deps --exclude-features "stdweb wasm-bindgen f32_float"
+
   # no-std builds are a bit more extensive to test
   no_std_build:
     name: NoStdBuild