[Bugfix] Refracture of not working `dht.c` Example

[hasenradball]

Refracture dht.c Example

• improve functionality
• add constants for:
  • Timeout Error
  • Checksum Error
  • Read OK

This code is adapted to the Pico c files and was mainly taken from here: AM2302-sensor

Tested

Code is tesed on Arduino NANO, ESP8266, and also on Pi Pico

Screeshot