[mt-datetime-picker] 能否自定義分鐘

### MintUI version
2.0.5

目前可選的分鐘值為 0,1,2,...,60

可否自定義分鐘，例如只顯示 0,10,20,30,40,50？甚至0,30

有些時候不需要那麼精確的時間，例如預約餐館通常只需要：五點半、七點整這種時間，分鐘的值不需要太多選擇。

Start by locating the mt-datetime-picker component and examining how its selectable minute values are defined. The requested behavior is configurable minute choices such as 0,10,20,30,40,50 or 0,30; done means the component supports this customization without removing its existing behavior.

Written by the indexing model from the issue text.