Add SparkFun FT231X Breakout board implementation with USB Micro-B connector

[Devesh36]

This pull request introduces a complete tscircuit implementation of the SparkFun FT231X Breakout board, including schematic, PCB layout, and component definitions. The main changes are the addition of the FT231X chip and USB Micro-B connector components, the board circuit definition, documentation, and updated module exports.

Component definitions:

• Added FT231X chip component with pin mappings, SSOP-20 footprint, silkscreen, and schematic arrangement in FT231X.tsx.
• Added USB_MICRO_B connector component with pin mappings, SMD footprint, silkscreen, and schematic arrangement in USB_MICRO_B.tsx.

Board circuit implementation:

• Created SparkFun-FT231X-Breakout.circuit.tsx defining the full breakout board, including FT231X, USB connector, resistors, capacitors, MOSFET reset circuit, status LEDs, and pin headers, with detailed net connections and layout.

Documentation and exports:

• Added a comprehensive README.md describing the board, features, pinout, components, usage, and references.
• Updated index.tsx to export the FT231X, USB Micro-B, and board circuit components for easy import and usage.

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[rushabhcodes]

Use this https://github.com/tscircuit/sparkfun-boards/blob/main/boards/SparkFun-microB-USB-Breakout/USB_MICRO_XNJ_JB.tsx