The dread pirate Captain the Cat is once again sailing the seas looking for treasure. The seas are, of course, a 2D list of strings where each string is one character long (mostly just "🌊" emoji). However, one of the elements will be a "💎" character, representing the treasure that Captain is looking for.

First, define a dataclass Position with the fields x (int) and y (int).

Then, define a function find_gem that consumes a 2D list of strings and produces a Position representing the x/y coordinate of the treasure character. Remember, the outer list is the y coordinate and the inner lists represent the x coordinate! You can trust that there is only one treasure per 2D list, and if the treasure is not found then just return the origin (0, 0) position.