Implement `MallocSizeOf` for `euclid` types #137

Job	Run time
Check code formatting	5s
Linux (1.63.0)	2m 23s
Linux (stable)	11s
Linux (beta)	19s
Linux (nightly)	16s
Linux (--features serde, 1.63.0)	2m 33s
Linux (--features serde, stable)	17s
Linux (--features serde, beta)	23s
Linux (--features serde, nightly)	22s
Linux (--no-default-features --features libm, 1.63.0)	2m 27s
Linux (--no-default-features --features libm, stable)	31s
Linux (--no-default-features --features libm, beta)	20s
Linux (--no-default-features --features libm, nightly)	16s
Linux (stable, --features mint)	18s
Linux (stable, --features bytemuck)	12s
Linux (stable, --features arbitrary)	12s
Linux (stable, --features malloc_size_of)	11s
Linux (nightly, --features unstable)	20s
Linux (nightly, --features unstable,serde)	21s
Result	1s
	11m 58s

Provide feedback