TCP Tx En GPIO type

[s-hadinger]

Description:

Support for native RS485 for TCP-Serial-Bridge:

• add TCP Tx En GPIO type, configure TCP Serial accordingly
• add clearTransmitEnablePin() to remove EN pin from TasmotaSeial
• update GPIO type in Berry
• add serial. config_tx_en(gpio:int) -> nil. Configure physical GPIO number, or -1 to clear EN Ping

Related issue (if applicable): fixes #21238

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