Extension to simplify adding requirements

[Truba]

Can we add an extension for simplifying addition of requirements, something like this:

options.addRequirement(key: "bluetooth") { (value) -> Bool in
    guard let value = value as? String else { return false }
    // Check device bluetooth version
    return value.starts(with: "5")
}

->

options.addRequirement(key: "bluetooth", ofType: String.self) { $0.starts(with: "5") }

[Filip2Stojanovski]

Hi @Truba

Thank you for the suggestion. This should be done with the #51 PR.