feat: add missing fns

src/stats/copulas/multivariate/gaussian.rs

@@ -1,15 +1,34 @@
 use std::error::Error;
 
 use ndarray::{Array1, Array2};
-use statrs::distribution::{Continuous, ContinuousCDF, Normal};
-
-use crate::stats::copulas::univariate::gaussian::GaussianUnivariate;
 
 use super::{CopulaType, Multivariate};
 
 #[derive(Debug)]
 pub struct GaussianMultivariate;
 
+impl GaussianMultivariate {
+  pub fn new() -> Self {
+    Self
+  }
+
+  fn transform_to_normal(&self) {}
+
+  fn fit_columns(&self) {}
+
+  fn get_distribution_for_column(&self) {}
+
+  fn fit_column(&self) {}
+
+  fn fit_with_fallback_distribution(&self) {}
+
+  fn get_correlation_matrix(&self) {}
+
+  fn get_conditional_distribution(&self) {}
+
+  fn get_normal_samples(&self) {}
+}
+
 impl Multivariate for GaussianMultivariate {
   fn r#type(&self) -> CopulaType {
     CopulaType::Gaussian