Problems with include path of libraries in microros

## Issue template

- Hardware description: STM
- RTOS: freeRTOS
- Installation type: microros_setup
- Version or commit hash: iron

#### Steps to reproduce the issue
I have compiled Microros as a static lib and added it using the compile flags. I have also added the folder libmicroros/include as an include path. However, the code does not find any of the headers because the folders are organized in the following way:
library_name/library_name/header_file.h. That's because the includes are /library_name/headear_file.h. In other words, I am forced to add each folder path as an include path. Is there a way to make it simpler? In the previous version of Microros, the folder organization was /library_name/headear_file.h, and the new version's code still follows that standard.

まず、libmicroros/include を作成する microros_setup の出力と、静的ライブラリに使用されるコンパイルフラグを調査します。生成されたヘッダーを、各ライブラリのディレクトリを個別に追加せずに 1 つのインクルードパスでインクルードでき、コードで使用されているインクルード構成にも一致していれば完了です。

索引モデルが issue の本文から書いたものです。