[WIP] Support non-recursive cte

[ding-young]

Related Issue

#393

Questions..

• entrypoint for translation?
• cte alias
• cte inside tablefactor::derived

WITH cte1 AS (SELECT 1)
SELECT * FROM (WITH cte2 AS (SELECT 2) SELECT * FROM cte2 JOIN cte1) AS dt;

TODO

• add more test case
• refactor..
• remove unnecessary clone

[coveralls]

Pull Request Test Coverage Report for Build 3816656986

• 227 of 231 (98.27%) changed or added relevant lines in 2 files are covered.
• 33 unchanged lines in 1 file lost coverage.
• Overall coverage decreased (-0.08%) to 98.514%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
core/src/translate/query.rs	86	90	95.56%

Files with Coverage Reduction	New Missed Lines	%
core/src/executor/aggregate/mod.rs	33	82.72%

Totals
Change from base Build 3781832138:	-0.08%
Covered Lines:	37998
Relevant Lines:	38571

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💛 - Coveralls