feat: add chat completion without streaming

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Describe the bug**
+
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+
+Steps to reproduce the behavior:
+
+1. ...
+2. ...
+
+**Expected behavior**
+
+A clear and concise description of what you expected to happen.
+
+**Screenshots**
+
+If applicable, add screenshots to help explain your problem.
+
+**Version**
+
+If applicable, what version did you use?
+
+**Environment**
+
+Add useful information about your configuration and environment here.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+**Describe the solution you'd like**
+
+A clear and concise description of what you want to happen.
+
+**Describe alternatives you've considered**
+
+A clear and concise description of any alternative solutions or features you've considered.
+
+**Additional context**
+
+Add any other context or screenshots about the feature request here.

.github/pull_request_template.md

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+## Description
+
+A clear and concise description of what your pull request is about.
+
+## Checklist
+
+- [ ] I updated the documentation accordingly. Or I don't need to.
+- [ ] I updated the tests accordingly. Or I don't need to.

.github/renovate.json

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+{
+  "extends": ["github>ivangabriele/renovate-config"]
+}

.github/workflows/test.yml

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+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 }}