Example/led strip update

[finger563]

Description

• Updated led_strip example to work on the Adafruit QtPy Neopixel BFF attached to a QtPy ESP32s3
• Updated led_strip to multiply color value by brightness if brightness is not sent as a separate byte
• Updated rmt_encoder to have sk6812 encoder and to indicate that it and the ws2812 encoder are for a clock of 10MHz
• Minor update to rmt
• Update led_strip example to use rmt component for transmitting data
• Update default target of led_strip example
• Rebuild docs

Motivation and Context

• Better showcase of using the LedStrip component with an actual array of LEDs
• Shows use of LedStrip with RMT

How has this been tested?

Building and running the example

Screenshots (if appropriate, e.g. schematic, board, console logs, lab pictures):

neopixel_bff.mp4

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation Update
• Hardware (schematic, board, system design) change
• Software change

Checklist:

• My change requires a change to the documentation.
• I have added / updated the documentation related to this change via either README or WIKI

Software

• I have added tests to cover my changes.
• I have updated the .github/workflows/build.yml file to add my new test to the automated cloud build github action.
• All new and existing tests passed.
• My code follows the code style of this project.