States.Hash with a Hash object does not produce the same hash value as stepfunctions simulator

[Fryguy]

There is a pending spec demonstrating this issue:

• floe/spec/workflow/intrinsic_function_spec.rb

  Lines 717 to 722 in a2bd4ee

  	it "with a hash (matching the stepfunctions simulator)" do
  	pending "TODO: figure out how the stepfunctions simulator serializes hashes"
  	result = described_class.value("States.Hash($.data, 'SHA-1')", {}, {"data" => {"foo" => "bar"}})
  	expect(result).to eq("dc2935b70ad43836e2e74df2d9758b1e51397997")
  	end

The fundamental problem is we don't know how the step functions simulator is serializing a JSON object such that they produce that hash value. Even so, this should only affect possible integrations between floe and amazon step functions, which is an unlikely combination.