class ViewComponent::SlotV2

the slot and return it.
If there is no slot renderable, we evaluate the block passed to

set as `@_content` and is returned directly.
If the slot renderable is a function and returns a string, it is

component instance, returning the string.
component, or a function that returns a component, we render that
If the slot renderable is a component, the string class name of a

There's currently 3 different values that may be set, that we can render.

Used to render the slot content in the template

def to_s
  view_context = @parent.send(:view_context)
  view_context.capture do
    if defined?(@_component_instance)
      # render_in is faster than `parent.render`
      @_component_instance.render_in(view_context, &@_content_block)
    elsif defined?(@_content)
      @_content
    elsif defined?(@_content_block)
      @_content_block.call
    end
  end
end