Description:

Berry virtual Energy driver, that makes it possible to create a 100% Berry energy driver:

• added OPTION A - 9 GPIO type to enable Berry Energy driver
• added energy.driver_enabled() to test if the Berry Energy driver is active (i.e. OptionA-9 is enabled)

For example, in autoexec.be:

if energy.driver_enabled()
  energy.phase_count = 1
  energy.voltage = 240
  energy.power_factor = 1.0
  energy.current = 1.5
  energy.frequency = 50
  energy.active_power = 360
end

Code size increase: 280 bytes

Checklist:

• The pull request is done against the latest development branch
• Only relevant files were touched
• Only one feature/fix was added per PR and the code change compiles without warnings
• The code change is tested and works with Tasmota core ESP8266 V.2.7.7
• The code change is tested and works with Tasmota core ESP32 V.3.0.4
• I accept the CLA.

NOTE: The code change must pass CI tests. Your PR cannot be merged unless tests pass