Workflow to label stale issues

[emhane]

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

[tynes]

I believe that we have this already, alongside autoclosing

[emhane]

do you have any links to the code? @tynes