Add ci to check feature powerset

Author: tottoto

.github/workflows/build.yml

@@ -145,3 +145,17 @@ jobs:
         with:
           components: clippy
       - run: cargo clippy --all-features -- --deny warnings
+
+  features:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout sources
+        uses: actions/checkout@v4
+        with:
+          persist-credentials: false
+      - name: Install rust toolchain
+        uses: dtolnay/rust-toolchain@stable
+      - name: Install cargo-hack
+        uses: taiki-e/install-action@cargo-hack
+      - name: Check feature powerset
+        run: cargo hack --no-dev-deps check --feature-powerset --depth 2