[Addition/Multiplication of BigIntegers] add testcase / change constraint of T #1022
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discord の議論にしたがって、下記を行った。
・ (large,small) , (small,large) の 2 ケースからなる入力を追加
・T の制約を変更(テストケースそのものはほとんど変わってない、制約変更はしたくない運用だと思うけど直後なのでゆるしてー)
・制約を残す場合、worst case が 1桁1桁 を T 個並べたものになりえて、それを入れるより良いかなということです。