(Rolling) Validation Improvements

[MikeCarbone]

• Validate enums are unique
• Can validate request data returns an array
• Validate valid types
• Validate each value in enums satisfies validation requirements
• Add special validation for URLs
• Validate each value in an array
• Allow setting validation rules for values in an array
• Refactor so that validations are pulled out and we can reuse them
  • For example, no easy way to check each value in an array
• When validation fails for min/max on string, suggest using min_length and max_length
• Validate that either every user has permissions or a default permissions array is supplied
• If DomainRestricted is used, a default_permissions array must be set
• If there is a parameter in a request,