Add practice exercise: word-search

[jimmytty]

• difficulty set to 8.
• .input and .expected mapped to TEXT -- json object each.

[IsaacG]

This exercise may benefit from an instructions append file describing the schema, including the format of the input objects and the expected output objects.

[jimmytty]

This exercise may benefit from an instructions append file describing the schema, including the format of the input objects and the expected output objects.

At first, I was thinking in remove json dependency at all, create columns with the grid and search words appended in a single TEXT column with newlines but I find a way to represent the expected output, it could be like a ascii report but there are words with null value when not found. But I'll take not about and try to describe better the exercise.

---

It seems has a bug in production I couldn't reproduce in online editor nor in a 3.41.2 local version that I have here in my machine and lots of tests agaist it have conflicting results. I'll try to find other ways to debugg it.