Rules for AIP-216, covering states.
|nesting||Lifecycle state enums should be nested within the resource.|
|state-field-output-only||Lifecycle State enum fields should be marked OUTPUT_ONLY|
|synonyms||Lifecycle state enums should be called "State", not "Status".|
|value-synonyms||Enforce common state values.|
Note: Because AIPs sometimes cover topics that have some overlap, some rules related to states may be included in the rules for other AIPs.