[Feature Request] More flexible filters on selectFilter() of SpladeTable

[sdiama]

After the last updates, the selectFilter() works like a charm but as I'm working on switching my existing admin section into Splade I came across with more ideas, that is nice to consider.

1. Filter based on null / not null value. E.x. posts that don't have a category etc.
2. Filter not only by equality, but with different than, bigger than, smaller than. E.x. previous tasks, scheduled tasks etc.
3. Between (bigger that a value and smaller than another value). E.x. users registered yesterday / previous week / last year, products that cost between 10 and 100, rooms with 2 or 3 beds etc.
4. Maybe? an anonymous function as parameter, (or a new method) where the dev could use directly the query builder to create special conditions.

[pascalbaljet]

Great ideas! Points 2 and 3 are high on my wishlist as well :)