use viem fully for managing typed signing

[chaitanyapotti]

Motivation and Context

Fixed Issue #1994
Jira Link:

Description

Fixed Issue #1994
Allow viem to manage the DAG verification and allow non-root to be primaryType

How has this been tested?

Tested with demo app

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• My code follows the code style of this project. (run lint)
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.
• My code requires a db migration.

[tuna1207]

lgtm