tech: revive example basic on refactor branch

[Danielduel]

I've repaired the basic example

Ive based on branch with refactor.

Added a utility to execute and compose handlers AND added an option for handler to throw to manifest that something went wrong in controlled way.

Created static file handler and I've tried my best to make it to stream data from reader.

I am not sure if this utility for reading import file will be useful - adding it for now.

Welcome back :eyes:

[mashaal]

This is amazing, I was chatting with @deckchairlabs about how we should migrate some (but not all) of our examples for the next release -- this is a perfect start