[BUG] `__init__` fails to add `latent` nodes in `nodes`

[daehyun99]

Describe the bug

• When declaring causal graph classes through the __init__ method, a problem occurred where the latents values were omitted.

To Reproduce

• Please refer to the sub-issue for bug reproduction.

Expected behavior

• When executing the nodes() method of the causal graph class, the latents nodes must also be included.
• When using the __eq__ method, it should return True for two instances of the same causal graph class, even if they were declared in different ways.

Additional context

Versions

[daehyun99]

same comment as in #2304

Since this bug is no longer a concern, I am closing this issue.

[ankurankan]

Ref #2322