Fix/getMaxDuty

[pljakobs]

• moved the getMaxDuty() implementation to the class implementations for all architectures. Before that, for esp32c3, it would always return 0, despite maxduty being correctly set.

[what-the-diff]

PR Summary

• Introduction of Max Duty Cycle
  This update includes a new method called getMaxDuty() to the HardwarePWM classes in Esp32, Esp8266, and Rp2040 cores. It simply means we have added a new feature that allows us to find out the maximum duty cycle.

• Header File Updated
  The header file HardwarePWM.h has been updated to just declare getMaxDuty(). This helps us maintain a cleaner and more organized code structure.

• Basic Function in Host Core
  A basic function of getMaxDuty() has been implemented in the Host core, which currently returns 0. Though it seems simple, it's the base for more complex operations that will be built upon it in the future.