LatentKroneckerGP for Learning Curve Prediction (#2647)

Summary:
Pull Request resolved: #2647

The `LatentKroneckerGP` model for joint learning curve and hyper-parameter modeling in AutoML. See [Lin et al. 2024](https://arxiv.org/abs/2410.09239).

Reviewed By: Balandat

Differential Revision: D66158880

Author: Jihao Andreas Lin