Don't check every returned object for lazy?

[rmosolgo]

This check results in a Kernel#class and Kernel#hash check for every returned value in GraphQL:

graphql-ruby/lib/graphql/execution/interpreter/runtime.rb

Lines 1000 to 1005 in a04428f

	def lazy?(object)
	@lazy_cache.fetch(object.class) {
	@lazy_cache[object.class] = @schema.lazy?(object)
	}
	end
	end

Somehow, I need a way to remove that. Strings, Floats, Integers, etc could all be assumed not-lazy?.

[rmosolgo]

Working up a fix for this in #4592