[New Snap] Chain138-Snap

## 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/bis-innovations/chain138-snap
- [x] Is the Snap distributed on [npm](https://www.npmjs.com/) and linked in this ticket? https://www.npmjs.com/package/chain138-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 Chain138 Snap repository and npm package first. Complete the audit-related checklist items by attaching the audit results, documenting vulnerabilities and their dispositions, and linking fixes where needed; the registry change is done when the corresponding pull request has been merged.

Written by the indexing model from the issue text.