Added support for Rule Waivers `expires-at`
The Rule Waivers expires-at
parameter can be one of:
- A Unix timestamp
- A RFC3339 formatted date
- A duration in ISO 8601 format (e.g.
P1Y2M3DT4H5M6S
) up to hours (e.g.PT1H
). We also support a "pseudo-ISO 8601" where the ISO 8601 is case insensitive and theP
andT
are facultative (e.g.1y2m3d4h
).