Revert "refactor(material/paginator): remove unused file (#27685)"

This reverts commit 8d44900.

src/material/paginator/_paginator-variables.scss

@@ -0,0 +1,15 @@
+// TODO: this file isn't used, but is kept for backwards compatibility. It should be deleted in v17.
+
+$height: 56px !default;
+// Minimum height for paginator's in the highest density is determined based on how
+// much the paginator can shrink until the content exceeds (i.e. navigation buttons).
+$minimum-height: 40px !default;
+$maximum-height: $height !default;
+
+$density-config: (
+  height: (
+    default: $height,
+    maximum: $maximum-height,
+    minimum: $minimum-height,
+  )
+) !default;