[Apps][Examples] Get Utxos from address

Summary: Example using chronik to retrieve the XEC and eToken UTXOs of a given address

Test Plan:
npm test
npm run getUtxosFromAddress <address>

Reviewers: bytesofman, #bitcoin_abc

Reviewed By: bytesofman, #bitcoin_abc

Differential Revision: https://reviews.bitcoinabc.org/D14170