ci(rust.yml): add workflow testing feature permutations

.github/workflows/rust.yml

@@ -91,3 +91,24 @@ jobs:
     steps:
     - uses: actions/checkout@v4
     - uses: EmbarkStudios/cargo-deny-action@v2
+
+  check:
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macos-latest, windows-latest]
+    runs-on: ${{ matrix.os }}
+    env:
+      RUSTFLAGS: -Dwarnings
+    steps:
+      - uses: actions/checkout@v4
+      - uses: dtolnay/rust-toolchain@stable
+      - uses: taiki-e/install-action@cargo-hack
+      - run: |
+          cargo hack check \
+            --feature-powerset \
+            --optional-deps \
+            --no-dev-deps \
+            --ignore-unknown-features \
+            --ignore-private \
+            --group-features runtime-async-std,async-io,async-std \
+            --group-features runtime-smol,async-io,smol