Adds the `Box3D::from_origin_and_size` associated function. (#520) #81

Job	Run time
Check code formatting	11s
Linux (1.56.0)	1m 1s
Linux (stable)	20s
Linux (beta)	18s
Linux (nightly)	20s
Linux (--features serde, 1.56.0)	1m 6s
Linux (--features serde, stable)	26s
Linux (--features serde, beta)	26s
Linux (--features serde, nightly)	23s
Linux (--no-default-features --features libm, 1.56.0)	58s
Linux (--no-default-features --features libm, stable)	21s
Linux (--no-default-features --features libm, beta)	19s
Linux (--no-default-features --features libm, nightly)	20s
Linux (stable, --features mint)	19s
Linux (stable, --features bytemuck)	21s
Linux (stable, --features arbitrary)	22s
Linux (nightly, --features unstable)	20s
Linux (nightly, --features unstable,serde)	24s
Result	1s
	8m 16s

Provide feedback