[enhancement] Allow custom truncation length for stdout

[Kristopher38]

This line limits stdout to 1000 characters: https://github.com/j178/leetgo/blob/18ee171db9a82326963227666d262f72ccaeb7db/leetcode/models.go#L84

It would be convenient to have the ability to change it via a CLI switch for local debugging purposes (e.g. for large testcases with a lot of debug prints). This could just be a boolean switch to disable truncating stdout.