PySplashsurf: f32 and f64 variants for tests (#232) #586

Job	Run time
Build splashsurf_lib with all features	3m 13s
Build splashsurf_lib with no default features	1m 12s
Run cargo fmt	6s
Check and build entire workspace	2m 47s
Build & test release mode	4m 19s
Publish to crates.io	0s
	11m 37s

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