Add turbo 8 meta helpers (#186)

[BarnabeD]

Add turbo_refreshes_with helper.

Work fine in a Phlex::Rails::Layout

html do
	head do
		yield(:head)
		# ...
	end
end

content_for :head do
	turbo_refreshes_with(method: :morph, scroll: :preserve)
end

[joeldrapper]

Thank you!