feat: add chat completion without streaming

.github/workflows/test.yml

@@ -0,0 +1,26 @@
+name: Test
+
+on: push
+
+jobs:
+  test:
+    name: Test
+    runs-on: ubuntu-latest
+    container:
+      image: xd009642/tarpaulin
+      # https://github.com/xd009642/tarpaulin#github-actions
+      options: --security-opt seccomp=unconfined
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Setup Rust
+        uses: actions-rs/toolchain@v1
+        with:
+          toolchain: 1.76.0
+      - name: Run tests (with coverage)
+        run: make test-cover
+      - name: Upload tests coverage
+        uses: codecov/codecov-action@v3
+        with:
+          fail_ci_if_error: true
+          token: ${{ secrets.CODECOV_TOKEN }}