Feature: Adding a multiselect option to Dropdown Select component

[pazdernikpavel]

Describe the feature request

I would like to introduce a new prop to the Dropdown Select component. This prop would be called multiselect and would be of type boolean with default value set to false.

What this option would do is simply convert input/output of the component from plain string to let's say an array of strings which would allow to select multiple values in the list meaning that [] would represent none items selected and ['cendric', 'caspar'] would result in two items being selected.

Describe the use case
It is pretty common use case to for example allow users to select multiple values from an enumeration. We are currently working on an internal project for Telecom and there are plenty of multiselects in the app design.

Describe alternatives you've considered
We considered coding our own solution which would be project related, but we wanted to take it first through the official way first.

Additional context

[amir-ba]

@pazdernikpavel the scale is now under maintenance mode and any new component need to be added through the community. You are more than welcome to join the contributions and propose a draft and initial implementation of the component. You can get in touch with me if you need more info about your setting up your local environment and getting started