Start PR labelling automation

.github/labeler.yml

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+github_actions:
+- .github/**/*
+
+test:
+- test/**/*
+
+knowledge panels:
+- lib/model/KnowledgePanel.g.dart
+- lib/model/KnowledgePanelElement.g.dart
+
+product:
+- lib/model/Product.dart
+- lib/model/Product.g.dart
+
+robotoff:
+- lib/model/RobotoffQuestion.g.dart
+
+pubspec:
+- pubspec.yaml
+
+ecoscore:
+- lib/model/EcoscoreData.g.dart
+
+personalized search:
+- lib/personalized_search/**/*
+
+folksonomy:
+- lib/folksonomy.dart

.github/workflows/label.yml

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+# This workflow will triage pull requests and apply a label based on the
+# paths that are modified in the pull request.
+#
+# To use this workflow, you will need to set up a .github/labeler.yml
+# file with configuration.  For more information, see:
+# https://github.com/actions/labeler
+
+name: Labeler
+on: [pull_request]
+
+jobs:
+  label:
+
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      pull-requests: write
+
+    steps:
+    - uses: actions/labeler@v2
+      with:
+        repo-token: "${{ secrets.GITHUB_TOKEN }}"