No Column Lineage Parsed for DML with SELECT query in parenthesis

[reata]

SQL:

INSERT OVERWRITE TABLE tab1
(SELECT col1 FROM tab2)

Column lineage is not correctly parsed while table lineage is fine.

$ sqllineage -f foo.sql -l table 
Statements(#): 1
Source Tables:
    <default>.tab2
Target Tables:
    <default>.tab1

$ sqllineage -f foo.sql -l column

The expected column lineage would be

<default>.tab1.col1 <- <default>.tab2.col1

[reata]

Closed by #371. Note this is only supported with sqlfluff implementation. We won't fix non-validating dialect.