Highlight diff when comparing data classes

[sksamuel]

data class Foo(a: String, b: String, c: String)
Foo("a", "b", "c") shouldBe Foo("a", "a", "a")

should output something like

Foo("a", "b", "c") did not equal Foo("a", "a", "a"):
  - diff in field b: "b" did not equal "a"
  - diff in field c: "c" did not equal "a"
```

[sksamuel]

This might be useful to take into account.
https://assertj.github.io/doc/#assertj-core-recursive-comparison

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.