Make division-by-zero behavior configurable

[knassre-bodo]

Currently, the behavior when division-by-zero occurs is purely controlled by the database being used to execute PyDough code. This should, instead, be configurable like some other settings through PyDoughConfigs. The configurable settings for division-by-zero can include:

• An option to let the database resolve it
• An option to always convert a / b to a / KEEP_IF(b, b != 0)
• An option to always convert a / b to CASE WHEN b = 0 THEN 0 ELSE a / b END

This configurable option should be noted in the documentation.