migrate-waniwani-sdk-0.18-to-0.19

Migrate a project from @waniwani/sdk 0.18.x to 0.19.x (first published: 0.19.1) and auto-apply its breaking change: suggestion.clicked (WidgetEvent / WidgetEventDetail from @waniwani/sdk/chat) gained a required properties.origin field (channel | page | flow | followup). Reading events through onEvent needs no changes; only code constructing a suggestion.clicked event literal must add origin. Also covers the…