Adds github action to close stale github issues

[pascal-roth]

Description

The workflow will find issues that have been inactive for 30 days and will add the specified comment and "stale" label. Additionally, the workflow will close any previously labeled issues if no additional activity has occurred in the next 14 days. All issues with the label "dev team" should be exempt.

Currently, the workflow will only label and/or close 30 issues at a time in order to avoid exceeding a rate limit.

Type of change

• New feature (non-breaking change which adds functionality)

Checklist

• I have run the pre-commit checks with ./isaaclab.sh --format
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• I have updated the changelog and the corresponding version in the extension's config/extension.toml file
• I have added my name to the CONTRIBUTORS.md or my name already exists there

[pascal-roth]

@kellyguo11 @jsmith-bdai review please

[jsmith-bdai]

Looks good, this will be super helpful!

[kellyguo11]

LGTM

[Dhoeller19]

Hi @pascal-roth,
Thanks for the suggestion. We must first make sure that we go through the whole backlog of Issues, then we could activate this.

[pascal-roth]

@Dhoeller19 do you think we can manage that within the next 1.5 months, that would be the time we have until the first issue closing would happen