+ Operators for map2 and map3

[gusty]

• In F# we have ||> which takes a tuple on the left side and applies each argument to a function on the right side
• In F#+ we have |>> which takes a value inside a functor and maps with a function on the right side

Therefore it would make sense to have:

• ||>> which takes a tuple with two functors and maps with a function on the right side. The is zip and map or simply map2.

Then it makes sense to add |||>> and the less idiomatic flipped versions <<|| and <<|||.

In the wild I've seen already cases where we have pipes with |>> and in the middle the need to switch to applicative (<!>, <*>) style, which breaks a bit the nice piping, In most of those cases these operators will be a good solution.

Open question about ||>>> and |||>>>.