Diff generator

[Derpius]

This function should generate a diff, optionally with ANSI colour codes via a boolean parameter, between two values. It should support deeply nested tables, accounting for circular references.

Acceptance criteria

• It takes two arguments: valueBefore and valueAfter
• It prints a table with correct indentation
• For fields that are equal between the two tables, it prints the field only once and with no colouring / annotation
• For fields that are different between the two tables
  • It prints the field in the before value
    • highlighted in red
    • with a - before it - this should be at the same horizontal position regardless of indentation
  • It also prints the field in the after value
    • highlighted in green
    • with a + before it - this should follow the same positioning as above
  • It prints the before and after values adjacent to each other vertically
  • It prints the before value before the after value
• It is used in matchers that can compare two table values, such as toEqual