Add Frame and FrameDesigner app_utils classes

[BeanRepo]

Add ledmatrix Frame and FrameDesigner to arduino/app_utils

Summary

This pull request introduces two app_utils classes to define self-validated brightness frames available for UNO Q Led matrix:

• Frame - a wrapper around a NumPy array of integer values representing the brightness of each LED in the matrix. It provides input/output and manipulation methods, with self validation whenever the array is modified.
• FrameDesigner - adds core functionality for manipulating LED matrix frames through various transformations.

Files changed

• src/arduino/app_utils/init.py — updated package exports and initialization.
• src/arduino/app_utils/ledmatrix.py — new implementation of the Frame and FrameDesigner classes.
• tests/arduino/app_utils/ledmatrix/test_frame.py — unit tests for the Frame class.

TL;DR

Add ledmatrix Frame and FrameDesigner classes with array transformation utilities and tests.