[KYLIN-4419] Make it possible to change metadata in some cases without rebuilding data - ASF JIRA

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KYLIN-4485 Create a self service interface for cube migration

1.	For LEAST_RESTRICTIVE consistency, which is the '=' operator, convert implicitly	Closed	Zhong Yanghong
2.	Add model compatibility check	Closed	Zhong Yanghong
3.	Allow to update table & database name	Closed	Zhong Yanghong
4.	Allow to change data type from varchar to date	Closed	Zhong Yanghong
5.	Relax checkValidationInModel() in TableSchemaUpdateChecker	Closed	Zhong Yanghong
6.	Send out notification email when triggering cube building job and finding out table schema changes	Open	Julian Pan