Add or_where_null and where_date

[LordDeveloper]

Please add where_date and or_where_null in QueryBuilder.

User.where(
    lambda q: query.where_date('online_at', '>', now().subtract(hours=12)).or_where_null('online_at')
)

[josephmancuso]

where_date needs to create a query like:

User.where_date("created_at", pendulum.now())

select * from users where date(`created_at`) = '2022-06-01'