Search Field: Implement Collapsible Behavior

[EdwardCoyle]

Is your feature request related to a problem or use case? Please describe. We need a collapsible setting for Search Fields that responds to breakpoints, in order to make IdsToolbar feature parable with 4.x

Describe the solution you'd like

• [ ] Add a new boolean setting collapsed to Search Field
  • toggled by CSS
  • ignored when the collapsible setting doesn't call for collapse being enabled
• [ ] Add a new enumerated setting collapsible:
  • none would be default
  • responsive for listening to a specific breakpoint
  • always to always be collapsible regardless of breakpoint
• [ ] Test specifically in IDS Toolbar and IDS Header, and ensure their corresponding styles are implemented as part of this issue
• [ ] Check all themes for this styling as well

Describe alternatives you've considered We should talk about how the breakpoint response system works, and maybe pull it into a more general mixin (related to #348)

[Sovia]

Landmark will need this feature for our web component implementation. We just need the ability for the input field to expand and collapse on a toolbar, we don't use the categories dropdown.