Berry add loglevel to mqtt.publish()

[s-hadinger]

Description:

Berry add an optional loglevel to mqtt.publish() to select the loglevel per message, instead of the default LOG_LEVEL_INFO(2). Setting 0 disables logging at all.

mqtt.publish(topic, payload [, retain:bool, start:int, len:int, loglevel:int]) -> nil

Since loglevel is the last optional argument, you can pass nil to the previous optional argument to ignore them and set the default valude, ex: mqtt.publish('{"k":"Testpayload"}', "/my/topic", nil, nil, nil, 0)

Follow-up of #21308 and a932b3d

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.2.7.8
• The code change is tested and works with Tasmota core ESP32 V.3.1.10
• I accept the CLA.

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