chore: import upstream snapshot with attribution

examples/custom_bootloader/bootloader_extra_dir/extra_bootloader_components/extra_component1/CMakeLists.txt

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+idf_component_register(SRCS "extra_component1.c")

examples/custom_bootloader/bootloader_extra_dir/extra_bootloader_components/extra_component1/extra_component1.c

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+/*
+ * SPDX-FileCopyrightText: 2024 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Unlicense OR CC0-1.0
+ */
+#include "esp_log.h"
+
+void bootloader_extra_dir_function(void)
+{
+    ESP_LOGI("EXTRA", "This function is called from an extra component");
+}

examples/custom_bootloader/bootloader_extra_dir/extra_bootloader_components/extra_component2/CMakeLists.txt

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+idf_component_register(SRCS "extra_component2.c")

examples/custom_bootloader/bootloader_extra_dir/extra_bootloader_components/extra_component2/extra_component2.c

@@ -0,0 +1,9 @@
+/*
+ * SPDX-FileCopyrightText: 2026 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Unlicense OR CC0-1.0
+ */
+
+void bootloader_extra_component2_marker(void)
+{
+}

examples/custom_bootloader/bootloader_extra_dir/extra_bootloader_components/extra_component3/CMakeLists.txt

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+idf_component_register(SRCS "extra_component3.c")

examples/custom_bootloader/bootloader_extra_dir/extra_bootloader_components/extra_component3/extra_component3.c

@@ -0,0 +1,9 @@
+/*
+ * SPDX-FileCopyrightText: 2026 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Unlicense OR CC0-1.0
+ */
+
+void bootloader_extra_component3_marker(void)
+{
+}