Reimplement `Enumerable#zip` with Enumerator
for fix some specs - [passes each element of the result array to a block and return nil if a block is given](https://github.com/ruby/spec/blob/a585ec35d185435e5c11f371ba4ed2a29d8817bd/core/enumerable/zip_spec.rb#L11-L17) - [converts arguments to arrays using #to_ary](https://github.com/ruby/spec/blob/a585ec35d185435e5c11f371ba4ed2a29d8817bd/core/enumerable/zip_spec.rb#L23-L27) - [converts arguments to enums using #to_enum](https://github.com/ruby/spec/blob/a585ec35d185435e5c11f371ba4ed2a29d8817bd/core/enumerable/zip_spec.rb#L29-L34) - [gathers whole arrays as elements when each yields multiple](https://github.com/ruby/spec/blob/a585ec35d185435e5c11f371ba4ed2a29d8817bd/core/enumerable/zip_spec.rb#L36-L39)
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