Support insert into values syntax

[imay]

Is your feature request related to a problem? Please describe.

Some user use Doris want to load data with JDBC. But now, Doris can not support insert into values (), ().

Describe the solution you'd like

So I want to support values clause in Doris, and this values can be seen as a SelectStmt.
values (1, 2), (3, 4) is seen as select a table which contain two rows (1, 2) and (3, 4)