Add a `.go` implementation of Top-K (probability based data structure)

[IAmRiteshKoushik]

Here's an academic paper reference - HeavyKeeper: An Accurate Algorithm for Finding Top-k Elephant Flows

[anushrithvic]

Hi @IAmRiteshKoushik ,
I would like to contribute by providing the go implementation of the Top -k (probability based data structure) to this repository. kindly consider assigning it to me. Thank you!