add release-drafter for easy GitHub release management

.github/release-drafter.yml

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+_extends: jellyfin/jellyfin-meta-plugins
+
+name-template: "Release $RESOLVED_VERSION"
+tag-template: "v$RESOLVED_VERSION"
+version-template: "$MAJOR.$MINOR.$PATCH"
+
+version-resolver:
+  major:
+    labels:
+      - 'major'
+  minor:
+    labels:
+      - 'minor'
+  patch:
+    labels:
+      - 'patch'
+  default: patch
+
+template: |
+  ## :sparkles: What's New
+
+  $CHANGES

.github/workflows/release-drafter.yaml

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+name: Release Drafter
+
+on:
+  push:
+    branches:
+      - master
+    tags:
+      - '*'
+
+jobs:
+  update_release_draft:
+    name: Update release draft
+    runs-on: ubuntu-latest
+    steps:
+      - name: Update Release Draft
+        uses: release-drafter/release-drafter@v5.15.0
+        with:
+          publish: ${{ startsWith(github.ref, 'refs/tags/') }}
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}