Add release drafter files

.github/release-draft-template.yml

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+name-template: 'Milli v$RESOLVED_VERSION'
+tag-template: 'v$RESOLVED_VERSION'
+exclude-labels:
+  - 'skip-changelog'
+version-resolver:
+  minor:
+    labels:
+      - 'breaking-change'
+  default: patch
+categories:
+  - title: 'Breaking changes ⚠️'
+    label: 'breaking-change'
+template: |
+  ## Changes
+
+  $CHANGES
+
+  Thanks again to $CONTRIBUTORS! 🎉
+no-changes-template: 'Changes are coming soon 😎'
+sort-direction: 'ascending'
+replacers:
+  - search: '/(?:and )?@dependabot-preview(?:\[bot\])?,?/g'
+    replace: ''
+  - search: '/(?:and )?@bors(?:\[bot\])?,?/g'
+    replace: ''
+  - search: '/(?:and )?@meili-bot,?/g'
+    replace: ''

.github/workflows/release-drafter.yml

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+name: Release Drafter
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  update_release_draft:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: release-drafter/release-drafter@v5
+        with:
+          config-name: release-draft-template.yml
+        env:
+          GITHUB_TOKEN: ${{ secrets.RELEASE_DRAFTER_TOKEN }}