Add VR calculation on results

[adamchengtkc]

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✅ Result of Pytest Coverage

---------- coverage: platform linux, python 3.10.13-final-0 ----------

Name	Stmts	Miss	Cover
warmth/init.py	3	0	100%
warmth/build.py	460	99	78%
warmth/data.py	1	0	100%
warmth/forward_modelling.py	703	78	89%
warmth/logging.py	7	3	57%
warmth/mesh_model.py	962	962	0%
warmth/mesh_utils.py	167	167	0%
warmth/model.py	41	18	56%
warmth/parameters.py	270	45	83%
warmth/postprocessing.py	292	172	41%
warmth/resqpy_helpers.py	196	196	0%
warmth/simulator.py	167	43	74%
warmth/utils.py	22	4	82%
TOTAL	3291	1787	46%
===========================	short	test	summary
FAILED	tests/test_builder.py::test_results	-	AssertionError:
Arrays	are	not	almost
Mismatched	elements:	4	/
Max	absolute	difference:	0.0526
Max	relative	difference:	0.11756817
undefined	x:	array([	nan,
undefined	y:	array([	nan,
FAILED	tests/test_integration.py::test_integration_single_rift	-	AssertionError:
Arrays	are	not	almost
Mismatched	elements:	54241	/
Max	absolute	difference:	203.27415552
Max	relative	difference:	0.19907862
undefined	x:	array([[	nan,
undefined	[	5.	,
undefined	[	8.5	,
undefined	y:	array([[	nan,
undefined	[	5.	,
undefined	[	8.46,	8.46,
FAILED	tests/test_integration.py::test_integration_multi_rift	-	AssertionError:
Arrays	are	not	almost
Mismatched	elements:	53278	/
Max	absolute	difference:	139.78340498
Max	relative	difference:	0.12386042
undefined	x:	array([[	nan,
undefined	[	5.	,
undefined	[	9.09,	9.09,
undefined	y:	array([[	nan,
undefined	[	5.	,
undefined	[	8.71,	8.71,
==================	3	failed,	8