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The idf_project_default macro is intended to be used by default for
ESP-IDF projects. Currently, it handles the necessary project
initialization that must occur after CMake's project() is called. It
creates the default executable based on the project name and links a
library to it, based on the main component and its transitive
dependencies. This macro will be further extended to also generate
binary image, project metadata, and add other expected targets. It
primarily serves as a replacement for the project() macro used in
cmakev1.
Expected typical usage:
```
cmake_minimum_required(VERSION 3.22)
include($ENV{IDF_PATH}/tools/cmakev2/idf.cmake)
project(hello_world LANGUAGES C CXX ASM)
idf_project_default()
```
Signed-off-by: Frantisek Hrbata <frantisek.hrbata@espressif.com>