(feature) add MCU "model" with chip revision, IDF revision, total Filesystem size

[softhack007]

Allow a few extra fileds in the device report data:

• chip model with revision - currently available in MM only, in the "e32model" field
• LittleFS filesystem size - there are still some broken "ESPHome flasher" installs with a tiny 60kB FS
• esp-idf core version (major version should be enough, maybe with an addition to indicate tasmota core)

/json/info

• "e32model":"ESP32-S3 v0.2" - WLED-MM only, - can be backported to upstream
• "fs":{"u":4288,"t":10354,"pmt":0} - all forks - "t" is the total Filesystem size in bytes, should be rounded to KB
• "core":"v4.4.6-dirty" - all forks - would need some filtering because we only need "v4.4", "v3.x". "v4.4 tasmota", etc

[netmindz]

I'll have a think about how to structure this extra data