Add vascular resistance quantity

[Jagailo]

https://en.wikipedia.org/wiki/Vascular_resistance

1. I know that negative powers are not welcome, but for dyn·s/cm⁵ and dyn·s·cm⁻⁵ units I added 2 options because both are equally common.
2. The unit MPa·s/m³ comes with the mega- prefix because that is the only combination that is used. I have not seen it as just Pa·s/m³ or in any other form.
3. WhodUnit actually has 3 different abbreviations, but they all mean the same thing. For mmHg·min/l, translating popular units into Russian was not difficult, but for WU and HRU I had to improvise. WU - Wood Units, which in turn is translated as "Единицы Вуда" (Units of Wood), so two words in the Russian version have changed places, and the capital letters form ЕВ (WU = ЕВ). For HRU I translated Hybrid Resistance Unit and used the capital letters of the Russian version. Translated as "Единицы Гибридного Сопротивления" (HRU = ЕГС)

[angularsen]

This quantity on the surface feels very domain specific, and I am a little hesitant to add it as we strive to balance adding the most widely used units that many benefit from, without bloating the library with exotic units. There are extremely many domains in the world, with their own units.

Could this be generalized into fluid resistance maybe? It seems to have the same dimensions of the units at least.

https://www.vcalc.com/wiki/Fluid-Resistance-Unit-Conversion

[Jagailo]

Sounds logical, I'll add it sometime after the holidays.