Move embedded C code to a header file

[Geyslan Gregório]

Since embedded C code is placed as a comment in Go files, we could move into a C header file, enabling the use of tools for automatic formatting and checking following the Tracee way.

This is related to main changes on building - #177.

However, for this, the goals are only:

• move the C code to a header to be included in the embedded part.
• format the new header file using clang-format.