fix(migration): invalid behavior while using -- or /* */ inside column string

[farnabaz]

Having one of the below queries

insert into table (content) values ('---\nkey: value\n---');
insert into table (content) values ('```\n/* this is comment */\n```');
insert into table (content) values ('hello; world');

breaks migration execution

So far I have found three breaking characters.

• -- inline comment format: Removes everything after -- (assumes it is a comment)
• /* */ multi-line comments: Removed content between
• ; query separator: Splits to invalids queries

I added some tests to check splitter behavior, We can improve tests if some known edge cases are missing.

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