Support for ESPHome Servo

[BeardedTinker]

Needed to test if servo was OK or dead so created simple ESPHome yaml and HA integration to check it.

Code was adapted from code available on this community forum link:

https://community.home-assistant.io/t/pwm-servo-control-with-esphome/111762

[BeardedTinker]

PIN used was D1 and also 5V and GND.