Extract Coordinate, IntegerRange and Coordinate3d to new AdventOfCode.HelperClasses project and refactor solution for modularity and type consistency

AdventOfCode.HelperClasses/IntegerRange.cs

@@ -0,0 +1,28 @@
+namespace AdventOfCode.HelperClasses;
+
+public record IntegerRange(long start, long end)
+{
+    public long Count() => end - start + 1;
+
+    public bool Contains(long number) => start <= number && end >= number;
+
+    public bool TryCombine(IntegerRange other, out IntegerRange combined)
+    {
+        if (Contains(other.start))
+        {
+            var isEndInRange = Contains(other.end);
+            combined = isEndInRange ? this : this with {end = other.end};
+            return true;
+        }
+        
+        if (other.Contains(start))
+        {
+            var isEndInRange = other.Contains(end);
+            combined = isEndInRange ? other : other with {end = end};
+            return true;
+        }
+
+        combined = this;
+        return false;
+    }
+}