feat(events): add api auth type details to events

[lsampras]

Type of Change

• Bugfix
• New feature
• Enhancement
• Refactoring
• Dependency updates
• Documentation
• CI/CD

Description

• Add AuthenticationType enum to represent the various possible authentication types
• update the AuthenticateAndFetch to also return the type of authentication
• Add this authentication type field to api event

Additional Changes

• This PR modifies the API contract
• This PR modifies the database schema
• This PR modifies application configuration/environment variables

Motivation and Context

• This info now allows us to audit our api calls more precisely about the source of these api calls

How did you test it?

• checking local logs after an API request

Checklist

• I formatted the code cargo +nightly fmt --all
• I addressed lints thrown by cargo clippy
• I reviewed the submitted code
• I added unit tests for my changes where possible
• I added a CHANGELOG entry if applicable