Early Stopping Mechanism for qiskit ML Algorithms

[Ashad001]

What should we add?

Implement an early stopping callback for qiskit-machine-learning algorithms, allowing us to halt training when the objective function shows no improvement for a set number of iterations.

Early stopping is a common technique i.e. keras to save computation and prevent overfitting. Adding support for this across qiskit algorithms (like VQC, QSVC) would enhance the training process without needing custom implementations.