importance sampling creation

[am-kaiser]

Business need

Functionality to help users to create importance samples and weights if the env data distribution is known.

Definition of done

• move importance sampling creation to src
• verified math according to paper
• link paper as source
• minimal unit test

Notes

• Theory is explained in the apendix of: "Winter, Sebastian, Christian Agrell, Juan Camilo Guevara Gómez, and Erik Vanem. “Efficient Long-Term Structural Reliability Estimation with Non-Gaussian Stochastic Models: A Design of Experiments Approach.” arXiv, March 3, 2025. https://doi.org/10.48550/arXiv.2503.01566."

Future work

• nice to have: code how to get env data distribution if it is unknown