Added Dart workflow, dependabot and CODEOWNERS

.github/CODEOWNERS

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+* @ricardoboss

.github/dependabot.yml

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+# To get started with Dependabot version updates, you'll need to specify which
+# package ecosystems to update and where the package manifests are located.
+# Please see the documentation for all configuration options:
+# https://docs.github.com/code-security/dependabot/dependabot-version-updates/configuration-options-for-the-dependabot.yml-file
+
+version: 2
+updates:
+  - package-ecosystem: "pub" # See documentation for possible values
+    directory: "/" # Location of package manifests
+    schedule:
+      interval: "weekly"

.github/workflows/dart.yml

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+name: Dart
+
+on:
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "main" ]
+
+jobs:
+  test:
+    name: Analyze, format, and test
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: dart-lang/setup-dart@v1
+
+      - name: Cache dependencies
+        uses: actions/cache@v4
+        with:
+          path: ${{ env.PUB_CACHE }}
+          key: ${{ runner.os }}-pub
+
+      - name: Install dependencies
+        run: dart pub get
+
+      - name: Verify formatting
+        run: dart format --output=none --set-exit-if-changed .
+
+      - name: Analyze project source
+        run: dart analyze --fatal-infos
+
+      - name: Run build_runner
+        run: dart run build_runner build --delete-conflicting-outputs
+
+      - name: Run tests
+        run: dart test