contributing/library-infrastructure-issues isn't organized well

I think that it would be good to add a few dropdowns for stuff like permissions, code formatting, missing files, release states, etc. This should make it more readable and easier to look at a group of issues that are often interconnected.

Inspect the contributing/library-infrastructure-issues issue template and the repository's contribution configuration first. Add organized dropdowns for permissions, code formatting, missing files, and release states, then verify that the template is easier to scan and group related issues.

Scritto dal modello di indicizzazione a partire dal testo della issue.