Adding support for Hedera

[swirlds-matt]

Request

This PR adds support for Hedera. We'd love for you to include us over at https://nakaflow.io/

Implementation Notes

• We've implemented support for paginated HTTP requests over to https://mainnet-public.mirrornode.hedera.com/api/v1/network/nodes
• Each node's "stake" property is aggregated, placed in descending order, and passed to the utility calculation for the Nakamoto coefficient.

About Hedera

Hedera is an open-source, leaderless proof-of-stake public ledger. Hedera’s robust ecosystem is built by a global community, on a network governed by a diverse council of industry-leading organizations

https://hedera.com/ https://twitter.com/hedera

[swirlds-matt]

Hey @xenowits - I've rebased and provided commits for each change request. Let me know if you need anything else 👍

[swirlds-matt]

@xenowits - I've updated code to cater to the latest requests 👍

[swirlds-matt]

Perfect, thank you! How often does the code get pushed over to https://nakaflow.io/?