Workflow to label stale issues

Add ci workflow to run on cronjob for labelling stale issues `S-stale`

**Additional context**
https://github.com/paradigmxyz/reth/blob/main/.github/workflows/stale.yml

Verify existing workflow for closing issues labelled `S-stale` or add it if doesn't exist

Start by reviewing the repository's existing workflow files and compare the referenced .github/workflows/stale.yml configuration. Verify whether an S-stale closing workflow already exists; done means a cron-triggered workflow labels stale issues and closes issues marked S-stale as required.

Written by the indexing model from the issue text.