[ecash-herald] Present daily total volume for agora

Summary:
Depends on D17118

Calculate and present total agora volume for partial and oneshot txs.

Later will also get this information on a per-token basis. But we want the total summary as well, so do that first.

Test Plan:
npm test

Reviewers: #bitcoin_abc, emack

Reviewed By: #bitcoin_abc, emack

Differential Revision: https://reviews.bitcoinabc.org/D17119