refactor: big refactor of test system

Author: LeonidElkin

tests/__init__.py

@@ -0,0 +1,11 @@
+"""
+PySATL Core
+===========
+
+Minimal core for probabilistic distributions: types, strategies, fitters,
+and graph-based characteristic resolution.
+"""
+
+__author__ = "Leonid Elkin, Mikhail, Mikhailov"
+__copyright__ = "Copyright (c) 2025 PySATL project"
+__license__ = "SPDX-License-Identifier: MIT"