Add Stale-bot

This file configures the following stale-bot:
https://github.com/apps/stale

It is set to mark issues as "Stale" after 365 days
It is also set to auto-close the issue 90 days after.

Please be aware that this issue also requires-
The listed stale-bot being added to the repo.

Reviewed-by: George Melikov <mail@gmelikov.ru>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Kjeld Schouten-Lebbing <kjeld@schouten-lebbing.nl>
Closes #10778