New Variant: Toggle Group Full width  #968

Per a request from RHOI during a chatbot sync:
Looking to improve our side panel configuration for RHOAI. We were looking to use the toggle group to swap back and forth between chat configurations for chat comparison but the current toggle group does not support spanning the width of the side panel. Can we add support for this?

RHOI playground demo (need VPN to view)

Goal/Action:

• Add a new toggle group variant to the figma file that has a full width property -- similar to how the button has a block modifier to expand full width and the menu toggle has a full width property as well

• Follow up with engineering to add this to org

Jira Issue: PF-3896