Add RayCaster::get(_global)_point (#971)

# Objective

Fixes #968.

## Solution

Add the mentioned methods.

## Testing

I didn't test it, but the change is trivial. I did similar to what Bevy
does:

https://docs.rs/bevy_math/0.18.1/src/bevy_math/ray.rs.html#97

---------

Co-authored-by: Joona Aalto <jondolf.dev@gmail.com>

Author: Shatur

src/spatial_query/mod.rs

@@ -58,7 +58,7 @@
 //!             println!(
 //!                 "Hit entity {} at {} with normal {}",
 //!                 hit.entity,
-//!                 ray.origin + *ray.direction * hit.distance,
+//!                 ray.get_global_point(hit.distance),
 //!                 hit.normal,
 //!             );
 //!         }

src/spatial_query/ray_caster.rs

@@ -57,7 +57,7 @@ use bevy::{
 ///             println!(
 ///                 "Hit entity {} at {} with normal {}",
 ///                 hit.entity,
-///                 ray.origin + *ray.direction * hit.distance,
+///                 ray.get_global_point(hit.distance),
 ///                 hit.normal,
 ///             );
 ///         }
@@ -279,6 +279,18 @@ impl RayCaster {
             ));
         }
     }
+
+    /// Returns the point at a given distance along the ray.
+    #[must_use]
+    pub fn get_point(&self, distance: Scalar) -> Vector {
+        self.origin + self.direction.adjust_precision() * distance
+    }
+
+    /// Like [`Self::get_point`], but returns the point in global coordinates.
+    #[must_use]
+    pub fn get_global_point(&self, distance: Scalar) -> Vector {
+        self.global_origin + self.global_direction.adjust_precision() * distance
+    }
 }
 
 fn on_add_ray_caster(mut world: DeferredWorld, ctx: HookContext) {