[options] Add a tooltip to Option component

[tprouvot]

Is your feature request related to a problem? Please describe.
Some options may need extra information, it would be great to have a tooltip to give more info

Describe the solution you'd like
This tooltip property needs to be added to the Option class in options.js file

class Option extends React.Component {
  constructor(props) {
    super(props);
    this.onChange = this.onChange.bind(this);
    this.onChangeToggle = this.onChangeToggle.bind(this);
    this.key = props.storageKey;
    this.type = props.type;
    this.label = props.label;
    this.placeholder = props.placeholder;
    this.tooltip = props.tooltip;

Additional context
We would need to add slds-popover slds-popover_tooltip classes to slds.css

[tprouvot]

Thank you for handling this one @nshulman !