Automate Compilation of "examples" in Build Process

[endersuu]

I've recently been working with cppkafka master branch and noticed that the examples provided in the project are not compiled automatically as part of the default build process. I had to run make examples explicitly to compile them.

I believe it could be beneficial for new users if these examples were compiled automatically, as it would streamline the process of testing and exploring the library's functionality.

I understand there might be reasons for the current setup, and I am open to discussion. If this enhancement aligns with the project's goals, I am also willing to contribute by implementing this feature.