[Flow] combineLatest with custom transformer (e.g. not map transformer)

[hrach]

I miss combineLatest() which transformer behaves more like Flow.transform than Flow.map.

My usecase: I ('d like to) combine multiple flows and emit loading & success state between suspensions in trasformer:

val filter = ConflatedBroadcastChannel<Filter>()
val search = ConflatedBroadcastChannel<String>()

filter.asFlow().combineLatest(search.asFlow()) { f, s ->
    emit(LoadingResource())
   
    val data = fetchData(f, s) // suspending function
    emit(SuccessResource(data))
}

I may rewrite it to do a transformation to Pair, however it seems quite unnecessary and personally I have use cases for 4 flows (E.g. I would have to create a data class each time).

I could try to prepare a PR.

(Also, I would do this myself but the building-blocks of combineLatest are internal. :X)

[qwwdfsad]

Thanks for the issue! Your report along with the provided example was very useful for designing current and upcoming operators.