feat: display comment on result file

[waynexia]

Which issue does this PR close?

Closes #

Rationale for this change

Query comment is also good for understanding the result. We should include it either

What changes are included in this PR?

Display comment before query in the result file.

Before:

input:

-- example of capture group replacement
-- SQLNESS REPLACE (?P<y>\d{4})-(?P<m>\d{2})-(?P<d>\d{2}) $m/$d/$y
2012-03-14, 2013-01-01 and 2014-07-05;

result:

-- SQLNESS REPLACE (?P<y>\d{4})-(?P<m>\d{2})-(?P<d>\d{2}) $m/$d/$y
2012-03-14, 2013-01-01 and 2014-07-05;

03/14/2012, 01/01/2013 and 07/05/2014;

After

input:

-- example of capture group replacement
-- SQLNESS REPLACE (?P<y>\d{4})-(?P<m>\d{2})-(?P<d>\d{2}) $m/$d/$y
2012-03-14, 2013-01-01 and 2014-07-05;

result:

-- example of capture group replacement
-- SQLNESS REPLACE (?P<y>\d{4})-(?P<m>\d{2})-(?P<d>\d{2}) $m/$d/$y
2012-03-14, 2013-01-01 and 2014-07-05;

03/14/2012, 01/01/2013 and 07/05/2014;

Are there any user-facing changes?

I think this should be considered as breaking change

How does this change test

existing examples

[jiacai2050]

LGTM