FSHybridPLS 0.1.0

• Initial CRAN submission.
• Public API: predictor_hybrid(), simulate_hybrid_data(), split_all(), split_and_normalize_all(), fit_hybridPLS(), predict.hybridPLS(), print.hybridPLS(), cv_fit_hybridPLS(), create_idx_kfold(), inprod_predictor_hybrid(), inprod_pen_predictor_hybrid(), and load_and_preprocess_kidney_data().
• Internal algebra/helpers are unexported.
• Examples, tests, package documentation, vignette, and citation metadata added.