Add Graph Mining notebook(s) in Examples

[priyankaiitg]

Implement Graph Mining notebook based on algorithm in

Mining Homophilic Groups of Users using Edge Attributed Node Embedding, by Priyanka Sinha, Ritu Patel, Pabitra Mitra, Dilys Thomas, Lipika Dey, presented at The ACM WebConf 2022 (WWW'22) Graph Learning workshop.

https://www2022.thewebconf.org/PaperFiles/165.pdf

And inspired by IETF IAB AID 2021 workshop paper on Characterizing the IETF through its consensus mechanisms, by Priyanka Sinha, Michael Ackermann, Pabitra Mitra, Arvind Singh, Amit Kumar Agrawal (https://www.iab.org/wp-content/IAB-uploads/2021/11/Sinha.pdf)