Adding preprocessed library size check (fixes #12)

[eullerborges]

This includes a job in the default CMake GitHub Action to allow us to check the preprocessed size for every push.

The CMakeLists.txt is a bit on the hacky side since I couldn't find a better way to instruct CMake to generate a preprocessed file. Note that with this code, this check won't ever work for the Visual Studio compiler as the syntax for preprocessing with it is a bit different.

I've tested this to work properly in my fork. Today the preprocessed library has 3558 lines (on both Debug and Release) which is why I've set the limit to 4500 lines, following a similar reasoning as that of the time of writing of #12.

[codecov-io]

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[brenoguim]

The CMakeLists.txt is a bit on the hacky side since I couldn't find a better way to instruct CMake to generate a preprocessed file. Note that with this code, this check won't ever work for the Visual Studio compiler as the syntax for preprocessing with it is a bit different.

I think that is fine. Perhaps we can disable/adjust that for visual studio when time comes to support that.