Add ability to destroy/unbind/teardown

[eirikbacker]

Hi! Thanks for super work - so nice to se WebAPIs utilized in this way!

Situation:
I'm working in a webpage, where elements appear and disappear based on state.
Currently intl-number-input only binds events, but it has no destroy/unbind/teardown method, meaning there is no way to do garbage collection/free up memory.

Solution:
Add a .destroy method removing the instance and all listeners. Example API:

const numberInput = new NumberInput({
  el: document.querySelector('input'),
  options: {
    // see API reference
  }
})

// set initial value
numberInput.setValue(1234)

// Remove listeners and other references so element can be garbage collected
numberInput.destroy()

[dm4t2]

Hi, thanks for your feedback!

I will look into it 👍