Matter prepare events

[s-hadinger]

Description:

Matter prepare for support of events:

• Create EventHandler
• Publish two mandatory events at startup
• Minor code changed to better manage logging
• Stub for Generic Switch

Logging of new published events at startup:

00:00:02.366 MTR: +Add_Event (CRIT  ) [00]0028/0000 ( 5019) - 234946562U
00:00:02.395 MTR: +Add_Event (CRIT  ) [00]0033/0003 ( 5020) - 1U
00:00:02.418 MTR: Configuring endpoints
00:00:02.420 MTR:   endpoint =     0 type:root
00:00:02.421 MTR:   endpoint =     1 type:aggregator
00:00:02.424 MTR:   endpoint =     2 type:light3
00:00:02.426 RSL: RESULT = {"Matter":{"Initialized":1}}
00:00:02.438 MTR: Starting UDP server on port: 5540

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.3.0.1
• [x] I accept the CLA.

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