TypeAhead Multi Select should provide a way to pass props to the ChipGroup of its selections

[mturley]

I'm building a <Select variant="typeaheadmulti"> and only 3 selections are shown as chips before the overflow controls appear. It would be great to be able to customize that by passing my own numChips prop to the <ChipGroup> rendered here: https://github.com/patternfly/patternfly-react/blob/master/packages/react-core/src/components/Select/Select.tsx#L527

Perhaps an optional prop for <Select> called chipGroupProps could be made available that is only used if variant === 'typeaheadmulti', and the chip group could be customized in other ways as well.