gawk code examples ch01 and ch04

Hi Josiah,

I have worked with awk language, some examples in your book. Specifically, I have relied upon the java code from ch01 and ch04, and I have obtained the awk code that I just committed.

I found it very useful to contrast the performance of the extension gawk and run the benchmark with the same code you already have the repository of your project.

Only remains to thank you for the book, the repo and your dedication to the Redis community.

--Paulino