add UIKitComment, Comment element, upfill UIKitSubNav

src/jsMain/kotlin/dev/inmo/jsuikit/utils/OptionallyDraw.kt

@@ -0,0 +1,16 @@
+package dev.inmo.jsuikit.utils
+
+import androidx.compose.runtime.Composable
+import org.jetbrains.compose.web.dom.ContentBuilder
+import org.w3c.dom.Element
+
+@Composable
+inline fun <T : Element> optionallyDraw (
+    attrs: Attrs<T>? = null,
+    noinline contentBuilder: ContentBuilder<T>? = null,
+    whatToDraw: @Composable () -> Unit
+) {
+    if (attrs != null || contentBuilder != null) {
+        whatToDraw()
+    }
+}