PaymentResult and its implementations should extends Equatable

[Cteq3132]

Describe the bug The class PaymentResult and all its implementation are not comparable. In Flutter, classes must extend Equatable to be able to compare object between them. Not doing so produces the following result:

final resultA = PaymentAdvancedFinished(resultCode = "Accepted");
final resultB = PaymentAdvancedFinished(resultCode = "Accepted");

print(resultA == resultB); // => false

To Reproduce See above.

Expected behavior Class comparison implementation.

Screenshots /

Desktop (please complete the following information):

• OS: [e.g. iOS]
• Browser [e.g. chrome, safari]
• Version [e.g. 22]

Smartphone (please complete the following information):

• Device: [e.g. iPhone6]
• OS: [e.g. iOS8.1]
• Browser [e.g. stock browser, safari]
• Version [e.g. 22]

Additional context Add any other context about the problem here.