feat(rmt): added rmt component

[finger563]

Description

• Added rmt component with Rmt and RmtEncoder classes
• Added example showing the use of the Rmt component to control RGB LED on the TinyS3
• Updated docs
• Updated ci

Motivation and Context

One-wire LEDs are very common (requiring only data and no clock) - and can be easily driven with the RMT peripheral in ESP (they even provide examples for this. This allows many LEDs to be driven without using PWM and in a way that allows many different colors to be displayed simultaneously.

How has this been tested?

Building and running the example on the TinyS3.

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

rmt_example.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.