chore: specify external types for each crate (#496)

.github/workflows/lint.yml

@@ -41,3 +41,26 @@ jobs:
           reporter: 'github-pr-check'
           github_token: ${{ secrets.GITHUB_TOKEN }}
           clippy_flags: --workspace --all-features --tests --examples --bins -- -Dclippy::todo -Aunknown_lints
+
+  check-external-types:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Install Rust (nightly-2023-10-10)
+        uses: actions-rust-lang/setup-rust-toolchain@v1.5.0
+        with:
+          toolchain: nightly-2023-10-10
+
+      - name: Install just
+        uses: taiki-e/install-action@v2.20.2
+        with:
+          tool: just
+
+      - name: Install cargo-check-external-types
+        uses: taiki-e/cache-cargo-install-action@v1.2.2
+        with:
+          tool: cargo-check-external-types@0.1.10
+
+      - name: check external types
+        run: just check-external-types-all