Add MCP23S08 (output) support

[Frank-1964]

Description:

This patch supports the output mode for MCP23S08 gpio expander like used in KMP PRODINo ESP32 Ethernet v1 (https://kmpelectronics.eu/products/prodino-esp32-ethernet-v1)

Checklist:

• [ x] The pull request is done against the latest development branch
• [ x] Only relevant files were touched
• [ x] 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
• [ x] The code change is tested and works with Tasmota core ESP32 V.2.0.14
• [ x] I accept the CLA.

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

[Jason2866]

With Tasmota Arduino core 3.0.0, the W5500 Ethernet port can be used from the module.

[barbudor]

With Tasmota Arduino core 3.0.0, the W5500 Ethernet port can be used from the module.

@Jason2866 This PR has nothing to do with Ethernet & W5500

It extend the MCP23xxx GPIO extender driver to another device MCP23S08.
The board listed is just an exemple of a board that using that GPIO extender.
The fact that it also has W5500 is pure fotuity and has nothing to do about it
😄

[Jason2866]

@barbudor i know the difference ;-) Just noticed with the change from the PR and with newest Core the linked board is fully functional with Tasmota