Rule each doesn't work with list of macros

[jandudulski]

RSpec.describe "Contract" do
  subject(:contract) do
    Dry::Validation.Contract do
      register_macro(:foo) do
        key.failure("not a foo") unless value == "foo"
      end

      register_macro(:bar) do
        key.failure("not a bar") unless value == "bar"
      end

      params do
        required(:test).array(:string)
      end

      rule(:test).each(:foo, :bar)
    end
  end

  it "validates each" do
    res = contract.call(test: ["foo", "bar"])

    expect(res.errors.to_h).to eql(test: {0 => ["not a bar"], 1 => ["not a foo"]})
  end
end

This fails with error:

     NoMethodError:
       undefined method `flatten' for :foo:Symbol

Also when I change to rule(:test).each([:foo, :bar]) the result is not as expected as well:

       Diff:
       @@ -1,2 +1,2 @@
       -:test => {0=>["not a bar"], 1=>["not a foo"]},
       +:test => {1=>["not a foo"]},

[jandudulski]

I would expect this to work since rule(:foo).validate(:one, :two) works as expected.

[jandudulski]

Oh, actually rule(:foo).validate(:one, :two) this doesn't work as well - it just evaluates the first macro - tests added #543