Create a function to execute non async tasks asynchronousely

[pierre-emmanuelJ]

Can be useful for #87
PR: #89

• egoscale.command

• egoscale.booleanRequest Doesn't implement command interface

[greut]

egoscale.booleanRequest Doesn't implement command interface

💩

[greut]

Command ⊂ AsyncCommand
AsyncCommand ⊅ Command

Any AsyncCommand is also a Command. The opposite is false though.

BooleanRequest is only a helper method for commands where the (Async)Response is a booleanResponse. You man run them through the usual pipe, although you won't be able to cast it back to anything as it's an hidden type. <- this should probably be fixed though