Beejones/add validation safeguards

[beejones]

Problem: An app can send many times the same VC in a VP in order to do a DOS attack.

Solution: Added validation safeguards which limits the number of tokens that can be in a SIOP and the size of the token.

Validation: Added new unit tests

Type of change:

• [ ] Feature work
• [x] Bug fix
• [ ] Documentation
• [ ] Engineering change
• [ ] Test
• [ ] Logging/Telemetry

Risk:

• [ ] High – Errors could cause MAJOR regression of many scenarios. (Example: new large features or high level infrastructure changes)
• [x] Medium – Errors could cause regression of 1 or more scenarios. (Example: somewhat complex bug fixes, small new features)
• [ ] Small – No issues are expected. (Example: Very small bug fixes, string changes, or configuration settings changes)