Fix Validator signatures

[terary]

Several validators implement:

export interface IValidator {
  (...args: any[]): TValidatorResponse;
}

IDE code assist picks-up the signature ...args:any which is not helpful.

Need to change signatures return TValidatorResponse and not implement interface.

This has already been done for package export validators.. The internal validators will also need to be revised.

package export validators

• ValidateAllPredicatesAgainstOperator
• NoSingleChildRule
• ValidatePredicateAgainstOperator
• ValidateSubjectDictionary

[terary]

Issue is a nice-have not a necessity. Leaving as open for now.