Currently, we have the following internal APIs to snooze and unsnooze rules:

• POST /internal/alerting/rule/{id}/_snooze
• POST /internal/alerting/rule/{id}/_unsnooze

We should provide public APIs so users be able to snooze a rule, and/or add a schedule or remove a snooze from a rule.

DoD

• Audit the existing internal APIs and finalize the request and response schemas.
• Enhance the scheme if needed.
• Version the schema following the existing pattern we have for the rest of the rules.
• Add access: public to the routes' options.
• Add OAS.