Combine GitHub Actions into a unified CI workflow

.github/workflows/ci.yml

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+name: ci
+
+on:
+  push:
+    branches: [master]
+  pull_request:
+    branches: [master]
+
+# Cancel superseded runs on the same ref to save CI minutes
+concurrency:
+  group: ci-${{ github.ref }}
+  cancel-in-progress: true
+
+env:
+  CARGO_TERM_COLOR: always
+
+jobs:
+  fmt:
+    name: cargo fmt
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Install Rust toolchain
+        uses: dtolnay/rust-toolchain@stable
+        with:
+          components: rustfmt
+      - name: Check formatting
+        run: cargo fmt --all -- --check
+
+  clippy:
+    name: cargo clippy
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Install Rust toolchain
+        uses: dtolnay/rust-toolchain@stable
+        with:
+          components: clippy
+      - name: Cache cargo artifacts
+        uses: Swatinem/rust-cache@v2
+      - name: Run clippy
+        run: cargo clippy --all-features --all-targets -- -D warnings
+
+  test:
+    name: cargo test
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Install Rust toolchain
+        uses: dtolnay/rust-toolchain@stable
+      - name: Cache cargo artifacts
+        uses: Swatinem/rust-cache@v2
+      - name: Run tests
+        run: cargo test --all-features
+
+  doc:
+    name: cargo doc
+    runs-on: ubuntu-latest
+    env:
+      # Fail the build on any rustdoc warning
+      RUSTDOCFLAGS: -D warnings
+    steps:
+      - uses: actions/checkout@v4
+      - name: Install Rust toolchain
+        uses: dtolnay/rust-toolchain@stable
+      - name: Cache cargo artifacts
+        uses: Swatinem/rust-cache@v2
+      - name: Build documentation
+        run: cargo doc --all-features --no-deps