Template the runtime module. This PR includes changes of two kinds

• Make the runtime module header only.
• Make the classes and functions which access graph data template.

TODO:

• Maybe we should merge the changes of make module header only first? refactor(interactive): Make runtime module header only #4244
• Make sure the changes doesn't effect the query's performance.

We expose the Graph Interface via the following template class. Note this template's function are only defined, no implementation is provided.

template <typename GRAPH_IMPL>
class GraphInterface {
 public:
  using label_id_t = label_t;
  using vertex_index_t = typename GRAPH_IMPL::vertex_index_t;
  using edge_iterator_t = impl::EdgeIterator<GRAPH_IMPL>;

  template <typename EDATA_T>
  using sub_graph_t = impl::SubGraph<EDATA_T, GRAPH_IMPL>;

  label_id_t VertexLabelNum();
  label_id_t EdgeLabelNum() const;
  std::vector<label_id_t> GetVertexLabels() const;
  std::vector<label_id_t> GetEdgeLabels() const;
  label_id_t GetVertexLabelId(const std::string& label) const;
};

We specialize the template class for ReadTransaction. In this PR, we don't refactor the interface, we adapt almost the same interface as ReadTransaction.