chore(ci): use cargo-nextest for faster testing

.github/workflows/ci.yml

@@ -6,15 +6,20 @@ env:
   CARGO_TERM_COLOR: always
 
 jobs:
-  test:
-    name: Test
+  build:
+    name: Build and Test
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3
       - uses: dtolnay/rust-toolchain@stable
       - uses: Swatinem/rust-cache@v2
+      - name: Build
+        run: cargo build
+      - name: Doctests
+        run: cargo test --doc
+      - uses: taiki-e/install-action@nextest
       - name: Run tests
-        run: cargo test
+        run: cargo nextest run
 
   fmt:
     name: Rustfmt