Changes to List clearance of places

the items/last_cleared_revision response's property format changed from i64 to int64 for status 200

the items/created_at response's property type changed from integer to no type, and format from int64 to no format for status 200

added UnixTimeMillis to the items/created_at response property allOf list for the response status 200

the response required property items/created_at became not read-only for the status 200

the items/created_at response's property type changed from no type to integer, and format from no format to int64 for status 200

the items/last_cleared_revision response's property format changed from int64 to i64 for status 200

removed UnixTimeMillis from the items/created_at response property allOf list for the response status 200

the response required property items/created_at became read-only for the status 200