feat: Add new function get or else() to handle optional values

[nicpuppa]

Description

Create a new function get or else() in order to allow users to easily deal with optional value, this new fucntion accept two parameters:

• value -> the optional value to check
• default -> the default value to return in case the first parameter is null

Related issues

closes #618

[nicpuppa]

Hi @saig0, thank you for the review 🚀 Requested changes applyed 🎉