ESP32 Add lcd sleep command (IDFGH-11203)

[AndreaGreco]

Add code to set display in sleep mode.

Abstract

Some driver (ST7789) support sleep mode that reduce a lots power consumption.
In my case with 2inc-display Power consumption from 5mA to 0.3mA

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[suda-morris]

sha=71a91f104636add797b33609633b1eb885408323

[suda-morris]

Thanks for the contribution. Merged.