[Conformal EEG] Add TUEV Conformal Prediction Examples - Conventional and Covariate Shift

[Razin93937]

Contributor: Sayeed Sajjad Razin (razin93937@gmail.com)
Contribution Type: Examples, Model

Description
This PR adds two runnable example scripts demonstrating split conformal prediction workflows on TUEV EEG Events using ContraWR:

• Conventional conformal prediction via LABEL
• Covariate-shift adaptive conformal prediction via CovariateLabel (KDE-based shift correction using embeddings)

Files to review

• pyhealth\models\contrawr.py - Move x and y_true to self.device in ContraWR.forward() to prevent device mismatch errors.
• examples\conformal_eeg\tuev_conventional_conformal.py - Conventional conformal prediction (LABEL) on TUEV EEG events with ContraWR.
• examples\conformal_eeg\tuev_covariate_shift_conformal.py - Covariate-shift adaptive conformal prediction (CovariateLabel) using extracted embeddings.