[ecash-herald] Label addresses with emoji based on balance

Summary:
T2972

Add logic to the app to get balance information of addresses before msg is generated. This allows tagging addresses with creature emojis depending on their wealth.

Requires a good deal of support and helper functions to get to this feature.

• mocked chronik had to be upgraded to support chronik.script.utxos()
• Need to save the responses from chronik.script.utxos() to mocks to be able to do unit tests with these mocks
• Add emojis and balance thresholds to config

Test Plan: npm test

Reviewers: #bitcoin_abc, Fabien

Reviewed By: #bitcoin_abc, Fabien

Subscribers: Fabien

Differential Revision: https://reviews.bitcoinabc.org/D14099