add lerp function to util and lerp method to vector3

data/scripts/types/vector3.lua

@@ -216,6 +216,25 @@ end
 function Vector3:copy()
   return Vector3(self)
 end
+
+---Returns a new vector as a linear interpolation between self and b.
+---@param b vectorlike
+---@param t number
+---@return Vector3
+function Vector3:lerp(b, t)
+  -- return self:copy()
+  if not is_weak_vector3(b) then
+    error("Vector3: b must be a Vector3-like table. Returning copy of self.")
+    return self:copy()
+  end
+  local w = Vector3(b)
+  return Vector3{
+    util.lerp(self.x, w.x, t),
+    util.lerp(self.y, w.y, t),
+    util.lerp(self.z, w.z, t),
+  }
+end
+
 ---- CONSTANTS
 
 Vector3.UP = Vector3(0, 1, 0)