built-in-function: Support returning a null instead of returning zero when data/time functions come across with an exception

**Is your feature request related to a problem? Please describe.**

OpenMLDB have a lots of date/time built-in functions. For example, we provides functions like 'dayofyear()', `dayofweek()`, etc.
We would like to return a NULL value when an exception occurs during parse a date or time.\

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