maint: Add stale github action

[MikeGoldsmith]

Description

Adds a GitHub Action to automatically mark stale PRs and close them after inactivity, adapted from the opentelemetry-java workflow.

• PRs with no activity for 14 days are marked stale by
  • by adding a stale comment from configuration
  • adding the "Stale" label
• Stale PRs with no activity for a further 14 days are closed and add the close comment
• PRs with an exempt label are ignored
• Added section to CONTRIBUTING.md
• Issues are not affected

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

CI-only change, no code tests applicable.

Does This PR Require a Contrib Repo Change?

• Yes. - Link to PR:
• No.

Checklist:

• Followed the style guidelines of this project
• Changelogs have been updated
• Unit tests have been added
• Documentation has been updated

[emdneto]

do you know if this can add a label stale to the PRs? might be helpful

[MikeGoldsmith]

do you know if this can add a label stale to the PRs? might be helpful

Good idea, and after checking, the action does this automatically too. I'll update the description to say it does it.

• https://github.com/actions/stale?tab=readme-ov-file#close-stale-issues-and-prs

[tammy-baylis-swi]

Thanks again @MikeGoldsmith !

Could we also have a quick, generalized explanation under CONTRIBUTING Pull Requests section.

+1 to getting xrmx's opinion on 14+14.

[MikeGoldsmith]

Thanks again @MikeGoldsmith !

Could we also have a quick, generalized explanation under CONTRIBUTING Pull Requests section.

+1 to getting xrmx's opinion on 14+14.

Updated CONTRIBUTING.md in c6378c5

[xrmx]

I'm not a fan of this kind of automation for the following reasons, some are very selfish:

• I think this is targeting the effect and not the cause, or better this is not making a distinction if the contributors has lost interest or they haven't received attention from us
• Even myself, as one that opens these repositories most days of the week, will have PRs marked as stale
• I have enough github notifications already, I don't need more 😿

Said that since the majority of contributors are happy with this I'm not opposing to this.

[emdneto]

I'm fine because there's way to prevent stale by just adding labels