Berry add bytes().setbytes()

[s-hadinger]

Description:

Report of berry-lang/berry#300

Add a new method to copy a portion from a bytes() buffer to another bytes() object.

bytes().setbytes(offset_to:int, bytes_from:bytes [, offset_from:int, len_from:int]) -> nil

Copies by default the entire content of a buffer passed as argument starting at offset_to. The target buffer is not resized, so any buffer that does not fit is truncated.

You can optionally copy only a sub-section of the buffer, from offset_from and copy len_from bytes.

This will be useful for adressable leds / WS2812 animations.

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.2.7.4.9
• The code change is tested and works with Tasmota core ESP32 V.2.0.5
• I accept the CLA.

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