DisplayAsDate to make ms since epoch timestamps human-understandable

[Gohtraw]

Created an annotation to make timestamps more intuitive ( https://github.com/nightscout/AndroidAPS/issues/3657 ) @olorinmaia please tell me if I missed a spot.

[sonarqubecloud[bot]]

Quality Gate passed

Issues
2 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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[MilosKozak]

as this extends previous function I'd just replace dataClassToHtml

[olorinmaia]

@Gohtraw Thanks for looking into this. I've merged your PR into latest dev and from what I can see Meal data section is fixed. "IOB data" and "Result" are still showing timestamp in milliseconds on my test phone.

[MilosKozak]

whay is necessary to have both: dataClassToHtml and dataClassToHtmlDisplayAsDate ?