make sql file can turn off transaction

[taojoe]

when an sql file starts with "--transaction-off", means turn transaction off.
and print every sql when migrate.

[weavejester]

Thank you for the PR, however I'd rather we didn't add more special meaning to the filename. I'd consider implementing this as a specially-formatted comment but I'd need to think about it.

Also commit messages should be written in English and according to the contributing guidelines, and the commits should pass CI.

[taojoe]

it's not file name, it's file content starts with.

[weavejester]

Sorry, I misunderstood you previously. I think I'd prefer a comment like -- transactions: off, but it should be matched case insensitively and ignore whitespace and previous comments. I think we should also allow off, false, no, true, on and yes as valid values, similar to YAML.