Sugarcoat for constructing compound types

Copied from From #45

[NeKzor](https://github.com/NeKzor)
> I have another idea for declaring sized arrays. How about mapping a tuple to SizedArrayType/ArrayType or maybe even TypedArray?
Here is an example:
```ts
new Struct({
foo: [u8, 100], // length 100
});
```

[MierenManz](https://github.com/MierenManz)
> I've considered stuff like this in the past and eventho I really like how much cleaner it is compared to new SizedArrayType(u8, 100). I am conflicted if this magic is something we should want for the library.

[MierenManz](https://github.com/MierenManz)
> Maybe this is something we could do with decorators so that the magic spaghetti for it would be in a optional decorator somehow?