Add code generation for array

codegen/array/snippets/extend_capped

@@ -0,0 +1,19 @@
+  if (!array || !other) {{
+    return;
+  }}
+
+  u64 remaining_capacity = array->capacity - array->count;
+  if (other->count >= remaining_capacity) {{
+    return;
+  }}
+
+  {T} *item;
+  u64 items_to_add = other->count;
+  for (u64 i = 0; i < items_to_add; ++i) {{
+    item = wapp_{Tlower}_array_get(other, i);
+    if (!item) {{
+      continue;
+    }}
+
+    wapp_{Tlower}_array_append_capped(array, *item);
+  }}