Add codeowners file and RD config @chrisfisher (#27)

Author: chrisfisher

.github/CODEOWNERS

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+*       @authsignal/authsignal-core @authsignal/authsignal-engineers

.github/release-drafter-config.yml

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+name-template: "v$RESOLVED_VERSION 🚀"
+tag-template: "v$RESOLVED_VERSION"
+categories:
+  - title: "⚠️ Breaking Changes"
+    labels:
+      - "breaking"
+      - "major"
+  - title: "🚀 Features"
+    labels:
+      - "feature"
+      - "enhancement"
+  - title: "🐛 Bug Fixes"
+    labels:
+      - "fix"
+      - "bugfix"
+      - "bug"
+  - title: "🧰 Maintenance"
+    labels:
+      - "chore"
+      - "maintenance"
+  - title: "📚 Documentation"
+    labels:
+      - "documentation"
+  - title: "⬆️ Dependencies"
+    collapse-after: 5
+    labels:
+      - "dependencies"
+
+change-template: "- $TITLE @$AUTHOR (#$NUMBER)"
+change-title-escapes: '\<*_&'
+version-resolver:
+  major:
+    labels:
+      - "major"
+      - "breaking"
+  minor:
+    labels:
+      - "minor"
+      - "feature"
+  patch:
+    labels:
+      - "patch"
+      - "fix"
+      - "bugfix"
+      - "bug"
+  default: patch
+
+sort-by: "merged_at"
+sort-direction: "descending"
+
+exclude-labels:
+  - "skip-changelog"
+
+autolabeler:
+  - label: "documentation"
+    files:
+      - "*.md"
+  - label: "bug"
+    branch:
+      - '/fix\/.+/'
+    title:
+      - "/fix/i"
+  - label: "feature"
+    branch:
+      - '/feature\/.+/'
+  - label: "dependencies"
+    files:
+      - "build.gradle"
+
+template: |
+  ## Changes in Release v$RESOLVED_VERSION
+
+  $CHANGES
+
+  **Full Changelog**: https://github.com/$OWNER/$REPOSITORY/compare/$PREVIOUS_TAG...v$RESOLVED_VERSION

.github/workflows/release-drafter.yml

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+name: Release Drafter
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    types: [opened, reopened, synchronize]
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+jobs:
+  update_release_draft:
+    permissions:
+      contents: write
+      pull-requests: write
+    runs-on: ubuntu-latest
+    steps:
+      - uses: release-drafter/release-drafter@v6
+        with:
+          config-name: release-drafter-config.yml
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}