Berry: add scroll method to Leds_matrix

[Staars]

Description:

Adds new method to the Leds_matrix class for scrolling the pixel buffer in all directions. Support for RGB mode only, not RGBW.

Usage:
<my_matrix>.scroll(int: direction, bytes: outshift[,bytes: inshift])

• directions are 0 - up, 1 - left, 2 - down, 3 - right , 0/2 will shift a row and 1/3 shift a column
• outshift is a mandatory bytes buffer, that must at least have the size of column or row (depending on direction) * 3 (bytes per pixel). Providing such a buffer as boiler plate code prevents reallocations in the scroll routine.
• inshift is optional and has the same size requirements. Can be used for "endless" text scrolling.

The application code can be quite small. Here is an excerpt from a text scroller, where we scroll out from an offscreen buffer and use that date to scroll in the main screen:

self.offscreenController.matrix.scroll(1, self.clockfaceManager.outShiftBuffer) # 1 - to left, output - inOutBuf, no input buffer
self.matrixController.matrix.scroll(1, self.trashOutBuf, self.clockfaceManager.outShiftBuffer) # 1 - to left, unused output, input inOutBuf
 self.matrixController.leds.show();

In my testing with the Ulanzi clock performance was quite okay, although this is only pure Berry code and this could possibly be optimised later with a native function.

scroll.mov

Checklist:

• The pull request is done against the latest development branch
• Only relevant files were touched
• Only one feature/fix was added per PR and the code change compiles without warnings
• The code change is tested and works with Tasmota core ESP8266 V.2.7.8
• The code change is tested and works with Tasmota core ESP32 V.3.1.0.241206
• I accept the CLA.

NOTE: The code change must pass CI tests. Your PR cannot be merged unless tests pass