avrtos v2.1.0: Polling API

Main Features

• Polling API:
  Introduced polling API allowing threads to wait on multiple kernel objects simultaneously:
  • New k_poll() function to wait for events on semaphores, mutexes, FIFOs, and message queues
  • CONFIG_POLLING configuration option to enable/disable polling support
  • Add an example (poll) demonstrating polling with multiple kernel objects: https://github.com/lucasdietrich/AVRTOS/blob/main/examples/poll/main.c

Minor Changes

• Added pointer coloring macros for AVR architectures to embed color values in unused pointer bits:
• Exposed z_ker and z_main_thread as external symbols for advanced use cases
• Improved Dining Philosophers example for Arduino framework

Full Changelog: v2.0.0...v2.1.0