add examples for visualization helpers

Author: SimonBlanke

examples/plot_contour.py

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+from surfaces.test_functions.algebraic.test_functions_2d import BealeFunction
+from surfaces.visualize import plot_contour
+
+func = BealeFunction()
+fig = plot_contour(func)
+fig.show()

examples/plot_convergence.py

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+from surfaces.test_functions.algebraic.test_functions_nd import RastriginFunction
+from surfaces.visualize import plot_convergence
+
+func = RastriginFunction(n_dim=10)
+history = [120, 95, 80, 65, 50, 42, 35, 28, 22, 18, 15, 12, 10, 8, 6, 5, 4, 3]
+fig = plot_convergence(func, history)
+fig.show()

examples/plot_fitness_distribution.py

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+from surfaces.test_functions.algebraic.test_functions_nd import GriewankFunction
+from surfaces.visualize import plot_fitness_distribution
+
+func = GriewankFunction(n_dim=10)
+fig = plot_fitness_distribution(func, n_samples=5000)
+fig.show()

examples/plot_multi_slice.py

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+from surfaces.test_functions.algebraic.test_functions_nd import SphereFunction
+from surfaces.visualize import plot_multi_slice
+
+func = SphereFunction(n_dim=5)
+fig = plot_multi_slice(func)
+fig.show()

examples/plot_surface.py

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+from surfaces.test_functions.algebraic.test_functions_2d import AckleyFunction
+from surfaces.visualize import plot_surface
+
+func = AckleyFunction()
+fig = plot_surface(func)
+fig.show()