Support custom connection object types about absinthe_relay HOT 3 CLOSED

Note that the edge type name should be customizable too. It's the custom edges that have different properties. But, the custom connection type has to specify the custom edge type.

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@austinsmorris Custom edges should already be supported inside edge do ... end, eg, from the tests:

     connection node_type: :pet do
        field :twice_edges_count, :integer do
          resolve fn
            _, %{source: conn} ->
              {:ok, length(conn.edges) * 2}
          end
        end
        edge do
          field :node_name_backwards, :string do
            resolve fn
              _, %{source: edge} ->
                {:ok, edge.node.name |> String.reverse}
            end
          end
        end
      end

The issue here is really addressability -- there's no way (currently) to define multiple connection types (and related edge types) for a node type, or to refer to those connection types when defining a connection field. Fixing that now :-)

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Resolved by #13, will be released as part of v0.9.0.

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