add target reset

[Jason2866]

Description:

• add Reset device function in VSC/Platformio menu
  Some devices can not be resetted form esptool when manually put in flash mode via RST button (for example the S2 when using USB Port). The added function uses a trick to get device out of flash mode.

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.2.7.6
• The code change is tested and works with Tasmota core ESP32 V.3.0.0
• I accept the CLA.

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