CXXGraph::Graph object to have symmetry (parity) in signature for (add, remove) x (nodes, edges)

[ai-mannamalai]

Problem
I would like to edit the graph object in an algorithm flow; however the asymmetry in the code makes it
hard since removeEdge works on id_t, and removeNode works on UserId std::string. Add node and edge are also asymmetrical in their argument.

Describe the solution you'd like
We need both add node/edge to operate on id_t, and remove node/edge to operate on id_t;
We need both add node/edge to operate on node userId, and remove node/edge to operate on node userId_t;

Describe alternatives you've considered
Embarrassing alternatives; I'd not mention :(

Additional context
NA

[ZigRazor]

Perfect, I think is correct, you can work on this @ai-mannamalai