feat: add absement quantity and units

[nick-pascucci-spire]

Absement is a measure of the time-integrated displacement of an object. It is measured as a product of length and time. This PR adds an absement module to the SI system along with corresponding units.

[iliekturtles]

Thanks for the PR! I'm going to try to review today.

[iliekturtles]

Changes look really good. Only change that is really needed is wrapping one of the long lines:

diff --git a/src/si/absement.rs b/src/si/absement.rs
index a4b56a8..59bcaf1 100644
--- a/src/si/absement.rs
+++ b/src/si/absement.rs
@@ -74,7 +74,8 @@ mod tests {

         #[test]
         fn check_dimension() {
-            let _: Absement<V> = Length::new::<l::meter>(V::one()) * Time::new::<t::second>(V::one());
+            let _: Absement<V> = Length::new::<l::meter>(V::one())
+                * Time::new::<t::second>(V::one());
         }

         #[test]

Are there any other common units that should be added right now? You're also welcome to squash your commits into one.

[nick-pascucci-spire]

Only change that is really needed is wrapping one of the long lines

Sure thing, 549c53e should handle that.

Are there any other common units that should be added right now?

I think the most common ones are likely to be m*s, mm*s, km*s, ft*s, and km*h. This quantity is most likely to be used for PID control of actuators, so unless someone is doing something quite exotic these should be sufficient.

You're also welcome to squash your commits into one.

No problem, I'll squash and force push now.

[iliekturtles]

Excellent! Will merge once the build passes.

[nick-pascucci-spire]

Thanks for reviewing, and for uom! It's a great library.