Migrate Zeto circuits to buses in Circom 2.2

[jimthematrix]

hyperledger-labs/zeto#100

[github-actions]

This issue is stale because it has been open 30 days with no activity.

[Chengxuan]

Update on this issue. We've upgraded to 2.2 for circom.

Adoption to Bus stuck at how to construct an internal Bus object, the examples given in Circom docs and project requires the entire bus object to be surfaced as input.

Asked on Telegram but haven't got any anwer

[github-actions]

This issue is stale because it has been open 30 days with no activity.

[github-actions]

This issue is stale because it has been open 30 days with no activity.