feat(core): introduce lib to generate ids

[gabrieleAngius]

Is your feature request related to a problem? Please describe.
Currently we are using as id of items stored on our state the ID of the first instance created. It's not an huge problem but it's confusing since we often run in the following situation:

const instance = figma.createComponent() // returns something like: { id: 'AA' ... }
const newStateItem = {
  id: instance.id,
  name: '...'
  refIds: [instance.id]
}

Describe the solution you'd like
A nice solution could be to use libraries such as uuid to be sure the id of the state is not equal as one instance

example:

const instance = figma.createComponent() // returns something like: { id: 'AA' ... }
const newStateItem = {
  id: uuid(),
  name: '...'
  refIds: [instance.id]
}