Implement validator factories

[JSn1nj4]

Only a few validator factories will be implement initially. These will be related to each DTO class and supporting factory classes used for testing.

Starting list

• [ ] GithubEventValidatorFactory
• [ ] GithubUserValidatorFactory
• [ ] TweetValidatorFactory
• [x] TwitterUserValidatorFactory

Notes

• Validation rules

[JSn1nj4]

I'll have to revisit the validator factories and their tests. While throwing the last one together, I realized it was useless where I was trying to use it because it assumed the incoming data was already structured the way the GithubEventDTO was going to transform it.

The validator factories need to generate a validator that validates data returned directly from each endpoint matches the expected structure.

As an aside, this will help generate more meaningful notifications in Sentry.

[JSn1nj4]

Need to revisit this, maybe another way.