[New Snap] zkpf

## Checklist

All items in the list below needs to be satisfied.

- [x] Is the Snap repository publicly accessible and linked in this ticket? https://github.com/Numi2/zk-proof-of-funds/tree/main/zkpf/zkpf-snap
- [x] Is the Snap distributed on [npm](https://www.npmjs.com/) and linked in this ticket? https://www.npmjs.com/package/@numi2/proof-of-funds-snap
- [ ] Has an audit been performed and the audit report attached or linked in this issue? n/a
- [ ] Is a complete list of discovered vulnerabilities from the audit documented in this issue?
- [ ] For vulnerabilities that have been deemed necessary to be addressed, are the links to the fixes attached to this issue?
- [ ] For vulnerabilities that have been deemed not necessary to be addressed, is a reason for each of them documented in this issue?
- [ ] The corresponding pull request in this repo has been merged.

Review the linked zkpf Snap repository and its npm package first. Check whether audit materials, vulnerability decisions, fixes, and the corresponding merged pull request are available; the checklist is complete when each required item is documented or linked.

Written by the indexing model from the issue text.