Non-macro alternative to Ash.Query.filter

[vonagam]

All Ash.Query modifications - select, sort, limit, offset, build and so on - are usual methods. Except one, the most used - filter - it is a macro. So it needs a require statement to be used. Which is a little bit annoying when you want to add a simple filter and only once in a file... I just go for build(filter:) combo in that case.

Would be convenient to have non-macro variant of filter exposed (which is do_filter). Maybe under name where?

In small discussion on Discord the following proposal was made: add where in Ash 3.1 (because there are too many things already in Ash 3 and it is too late to change filter to non-macro method even though it is desirable) and make it a primary way to add filters to queries in docs, then in Ash 4 deprecate filter.