Split Combobox into two components

[mimarz]

Split Combobox into two components.

Reasoning:

• Reduce code complexity of the component
• Easier to have best ux for each mode
• We need different dom structure for each mode to best support screen readers
• Big changes coming to Combobox aria spec: https://www.w3.org/TR/wai-aria-1.2/#combobox

Notes:

• New names for the components?
• For multiple select, we force users to show selected options close to the input somewhere, either visually "inside" or right above input. This is important for screen readers
• Users should be able to choose if datalist should be rendered after input or in a popover
• If users need to condense multiple select, we will provide examples
• Check against issues and bugs in Combobox  #2610

Tasks

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1. Create single mode combobox named Suggestion #2882
   react +1
   

[mrosvik]

Suggestion: Can we put all the 3 select-components into a folder in Storybook to make it easier to find?