eachFind: first draft

[HGZdev]

I would like to shyly propose a new db search function .eachFind. It will works as .each until callback function fn returns the first positive result. Precisely, all fn's grouped in particular settleAll will be executed, but it is still a progress in compare to .each's full execution.

[wmertens]

I think this should return the found result, no?

As for the naming, I'm 90% ok with it, but I wonder if something like eachUntil might be better?

2 more considerations:

• each could also do this, by passing a stop token; if you return it, processing stops: .each( (item, STOP) => item.bar && STOP). Then we wouldn't need an extra method.
• I want to change the current meaning of limit, it is currently used to choose the number of items per run, I think it should mean the number of items total. Instead there should be something like pageSize = 50 and workers = 5 to load results per 50 and run 5 fns in parallel

[Dzieni]

Personally I'm more into doing this inside each, one function less to remember