Add Automatic Release Drafter Functionality to Prebid Repository

.github/release-drafter.yml

@@ -0,0 +1,28 @@
+
+name-template: 'Prebid $RESOLVED_VERSION Release'
+tag-template: '$RESOLVED_VERSION'
+categories:
+  - title: '🚀 New Features'
+    label: 'feature'
+  - title: '🛠 Maintenance'
+    label: 'maintenance'    
+  - title: '🐛 Bug Fixes'
+    labels:
+      - 'fix'
+      - 'bugfix'
+      - 'bug'      
+change-template: '- $TITLE (#$NUMBER)'
+version-resolver:
+  major:
+    labels:
+      - 'major'
+  minor:
+    labels:
+      - 'minor'
+  patch:
+    labels:
+      - 'patch'
+  default: patch
+template: |
+  ## In This Release
+  $CHANGES

.github/workflows/release-drafter.yml

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+name: Release Drafter
+
+on:
+  push:
+    # branches to consider in the event; optional, defaults to all
+    branches:
+      - master
+
+jobs:
+  update_release_draft:
+    runs-on: ubuntu-latest
+    steps:
+      # Drafts your next Release notes as Pull Requests are merged into "master"
+      - uses: release-drafter/release-drafter@v5
+        with:
+         config-name: release-drafter.yml         
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}