Add 'andThen' support for Stream api map / mapEffect, like Effect.andThen

[joepjoosten]

What is the problem this feature would solve?

Like the Effect.andThen, the Stream Api also needs some love.

Natural candidates for andThen:

map, mapEffect, flatMap -> andThen mapAccum, mapAccumEffect -> andThenAccum mapChunks, mapChunksEffect -> andThenChunks mapConcat, mapConcatEffect -> andThenConcat mapConcatChunk, mapConcatChunkEffect -> andThenConcatChunk

What is the feature you are proposing to solve the problem?

Easier for users, and i quote the docs: "a convenient all-in-one solution"

What alternatives have you considered?

No response