Add PR template and auto-labelling

.github/labeler.yml

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+# See https://github.com/actions/labeler
+dot: true
+port-to-master: '**'
+port-to-v1.10: '**'
+port-to-v1.9: '**'

.github/pull_request_template.md

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+<!---
+PRs to RelationalAI/julia must be opened to the correct branch (see
+https://github.com/RelationalAI/raicode/blob/master/nix/julia-version.json).
+-->
+## PR Description
+
+_What does this PR do?_
+
+## Checklist
+
+Requirements for merging:
+- [ ] I have opened an issue or PR upstream on JuliaLang/julia: <link to JuliaLang/julia>
+- [ ] I have removed the `port-to-*` labels that don't apply.

.github/workflows/labeler.yml

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+# See https://github.com/actions/labeler
+name: "Pull Request Labeler"
+on:
+- pull_request_target
+
+jobs:
+  triage:
+    permissions:
+      contents: read
+      pull-requests: write
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/labeler@v4