Add FreeRTOS port with blocking bsd socket API

[danielinux]

No description provided.

[Copilot]

Pull request overview

This PR adds a FreeRTOS port for wolfIP that provides a blocking BSD-style socket API wrapper around the non-blocking wolfIP core. The implementation follows the same architectural pattern as the existing POSIX wrapper, using a dedicated polling task and callback-driven synchronization with FreeRTOS primitives (mutexes and semaphores) to provide blocking socket semantics.

Changes:

• Added FreeRTOS port with blocking socket API wrappers for all standard BSD socket operations
• Implemented polling task that periodically calls wolfIP_poll() with mutex protection
• Added comprehensive documentation explaining the integration, design, and usage patterns

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 4 comments.

File	Description
src/port/freeRTOS/bsd_socket.h	Header file defining the public API for FreeRTOS socket initialization and BSD socket function declarations
src/port/freeRTOS/bsd_socket.c	Implementation of the FreeRTOS socket wrapper layer with polling task, FD management, and blocking socket operations
src/port/freeRTOS/README.md	Comprehensive documentation covering the port's design, API, integration steps, and configuration options
README.md	Updated main README to reference the new FreeRTOS port and external demo project

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