chore: add stale bot github action (#713)

Author: MarcusNotheis

.github/workflows/stale.yml

@@ -0,0 +1,31 @@
+name: Mark and close stale issues
+
+on:
+  schedule:
+  - cron: "30 1 * * *"
+
+jobs:
+  stale:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/stale@v1
+      with:
+        repo-token: ${{ secrets.GITHUB_TOKEN }}
+        # The number of days old an issue can be before marking it stale. Set to -1 to never mark issues or pull requests as stale automatically.
+        days-before-stale: 21
+        # The number of days to wait to close an issue or pull request after it being marked stale. Set to -1 to never close stale issues.
+        days-before-close: 30
+        # The message to post on the issue when tagging it. If none provided, will not mark issues stale.
+        stale-issue-message: >
+          Hi everyone! 
+          Seems like there hasn't been much going on in this issue lately. If there are still questions, comments, or bugs, please feel free to continue the discussion. 
+          Inactive issues will be closed after 30 days. Thanks.
+        # The message to post on the issue when closing it. If none provided, will not comment when closing an issue.
+        close-issue-message: >
+          Hey there, it's me again! 
+          I am going close this issue to help our maintainers focus on the current development roadmap instead. 
+          If the issue mentioned is still a concern, please open a new ticket and mention this old one. 
+        # The labels to apply when an issue is exempt from being marked stale. Separate multiple labels with commas (eg. "label1,label2")
+        exempt-issue-labels: 'good first issue,todo'