feat: add WS2812 support and related tests

- Replace onewire interface with ws2812 interface in retrosoc module.
- Include ws2812_math.c in C test sources.
- Add ws2812 header in test_runtime.c and implement ws2812 helper tests.
- Update ribp_topology_tb and soc_irq_topology_tb to handle ws2812 interface.
- Create ws2812_dma_tb and ws2812_tb for testing WS2812 DMA and waveform functionality.
- Enhance test_script_tools.py to include ws2812 in formal filelists.
- Modify test_soc_topology.py to ensure proper IRQ mapping for ws2812.
- Introduce test_ws2812.py for WS2812 register, waveform, and streaming regression tests.

scripts/run_c_tests.py

@@ -20,6 +20,7 @@ TEST_SOURCES = (
     "crt/src/lib/printf.c",
     "crt/src/lib/stdlib.c",
     "crt/src/lib/string.c",
+    "crt/src/hal/ws2812_math.c",
     "app/media/src/video_player.c",
     "app/media/src/wav_audio.c",
     "tests/c/test_runtime.c",