Multiple dates could have multiple inputs option

[m-hefti]

The picker manages multiple dates out of the box, but set them as a concatenated string in a single input.

It would be great, espacially for range pickers, to be able to set multiple inputs. The way to do it, through a new input fields option, could be something like:

1. New option (to be parsed in optionProcessors function?)
   this.optionsStore.input = undefined | <String> | <DOMElement> | Array <Strings> | Array <DOMElements>;

2. Initialize Inputs function (in Tempus Dominus class)
   _initializeInput() {
...
if (this.optionsStore.input instanceof Array) {
const inputs = this.optionsStore.input;
for (var i = 0; i < inputs.length; i++) {
inputs[i].dataset.tdInputIndex = i;
inputs[i].addEventListener('change', this._inputChangeEvent);
}
}
...
}

3. Input Change Event function (in Tempus Dominus class)
   this._inputChangeEvent = (event) => {
...
if (this.optionsStore.input instanceof Array) {
const inputs = this.optionsStore.input;
for (var i = 0; i < inputs.length; i++) {
this.dates.setFromInput(inputs[i].value, inputs[i].dataset.tdInputIndex);
}
}
...
}

It's not tested at all and will probably have a lot of other consequences (how are multipleDates and rangeSelection options linked together?), but might be a nice option to have.

Thank you for your consideration.