Parent ticket: #136213

Summary

Implement a new rule attribute revision of type long:

• All newly created rules should have revision set to 0
• On rule save, if rule params have been modified, increase the revision number by 1
• Revisions should not be modifiable by users, i.e., they are increased automatically and ignored when passed as arguments to functions that mutate rules
• Rule changes like activation/deactivation should not lead to revision increase
• Changes to dynamic rule attributes (rule state) like executionStatus, or monitoring should not lead to revision increase. See x-pack/plugins/alerting/server/saved_objects/mappings.ts for more examples.

Migrate all existing rules to the new revision field:

• For all existing rules, set revision to 0