[Enhancement] Add pagination for a source's media (#190)

* [WIP] added first attempt at pagination component

* Hooked up pagination for downloaded media

test/pinchflat/utils/number_utils_test.exs

@@ -0,0 +1,19 @@
+defmodule Pinchflat.Utils.NumberUtilsTest do
+  use ExUnit.Case, async: true
+
+  alias Pinchflat.Utils.NumberUtils
+
+  describe "clamp/3" do
+    test "returns the minimum when the number is less than the minimum" do
+      assert NumberUtils.clamp(1, 2, 3) == 2
+    end
+
+    test "returns the maximum when the number is greater than the maximum" do
+      assert NumberUtils.clamp(4, 2, 3) == 3
+    end
+
+    test "returns the number when it is between the minimum and maximum" do
+      assert NumberUtils.clamp(2, 1, 3) == 2
+    end
+  end
+end