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.

Start by inspecting the microros_setup output that creates libmicroros/include and the compile flags used for the static library. Done means the generated headers can be included using one include path, without adding each library directory separately, while matching the include layout used by the code.

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