unionFunction in std::solid

Union two or more solids into a single solid.

Name	Type	Description	Required
`solids`	[`Solid`; 2+]	The solids to union.	Yes
`tolerance`	`number(Length)`	Defines the smallest distance below which two entities are considered coincident, intersecting, coplanar, or similar. For most use cases, it should not be changed from its default value of 10^-7 millimeters.	No