feat: init @sheepdog/vanilla

[paoloricciuti]

This initialize @sheepdog/vanilla

So, i think i've almost finished the vanilla version (i still need to write all the tests tho)...I'm a bit puzzled by a couple of things:

1. those are the events that i've defined

type Events =
	| 'error'
	| 'finish'
	| 'cancel'
	| 'instance-create'
	| 'instance-start'
	| 'instance-complete';

type InstanceEvents = 'error' | 'finish' | 'cancel' | 'start' | 'success';

for instance i think it makes perfect sense...you get an event for each state (minus isRunning but you can infer that with a couple of events)
I'm, not super convinced about the ones for the task...technically also error ,finish and cancel should have the prefix instance- because at the end of the day it's one of the instances that is erroring, or starting or etc etc. so maybe it might make sense to just drop instance- everywhere?
3. do you think we should pass something to the events? Like if you do

const my_task = task(...);

my_task.on("error", (/*do you need something here?*/)=>{

});

const performed = my_task.perform();

performed.on("error", (/*what about here?*/)=>{

});

4. the task function is returning an object which resembles the store we are returning from svelte...but it's just an object. The idea is that since it's the same reference if you use it in an even listener it will be updated when you read the value. What do you think about it?

I think we need to bikeshed it a bit and try to build something with it to get the feel but i'd say i'm pretty happy with the result

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