feat: add new Toolbar component

[karrui]

Toolbar component is currently going to be used by the Table component, but could also imagine it being used for a Text Editor

Part of #237

New components exposed:

• Toolbar, parent container that passes all the props in
• ToolbarGroup, sets preset spacing, optional
• ToolbarButton, button for toolbar
• ToolbarIconButton, icon button for toolbar
• ToolbarDivider, divider for toolbar

Story has been added to show how to use the component

// Example usage
const Example = ({ children, size, colorScheme }) => {
  return (
    <Toolbar size={size} colorScheme={colorScheme}>
      <Text>1 item selected</Text>
      <Spacer />
      {children}
      <ToolbarGroup>
        <ToolbarButton leftIcon={<BxUpload fontSize="1.25rem" />}>
          Download
        </ToolbarButton>
        <ToolbarButton leftIcon={<BxsTimeFive fontSize="1.25rem" />}>
          Move
        </ToolbarButton>
        <ToolbarDivider />
        <ToolbarIconButton icon={<BxUpload />} aria-label="Upload" />
        <ToolbarDivider />
        <ToolbarButton>Cancel</ToolbarButton>
      </ToolbarGroup>
    </Toolbar>
  )
}

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