Add method to map plaxis cut volumes to convex hulls

[PabloVasconez]

No description provided.

[coveralls]

Pull Request Test Coverage Report for Build 6875090498

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• 75 of 91 (82.42%) changed or added relevant lines in 5 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-5.9%) to 92.017%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/plxcontroller/geometry_3d/convex_hull_3d.py	43	45	95.56%
src/plxcontroller/plaxis_3d_input_controller.py	4	6	66.67%
src/plxcontroller/plaxis_3d_output_controller.py	10	22	45.45%

Totals
Change from base Build 6826842530:	-5.9%
Covered Lines:	219
Relevant Lines:	238

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💛 - Coveralls