Feature: Add a utility function to check if a certain graph is valid

[rubenmate]

Background:

In our application, we frequently encounter scenarios where users need to validate the structure and integrity of graphs. Ensuring that graphs are correctly formed and adhere to specific rules is crucial for accurate analysis and visualization. To streamline this process and enhance user experience, we propose implementing a utility function specifically designed to check the validity of graphs.

Goals:

• Develop a utility function that can validate the structure and integrity of graphs based on predefined rules.

Proposed Solution:

• Define a structure to store the state of the graph in memory
• Define a function that checks that a certain graph is valid or not following the rules in a E-R model.