fix(gnovm): object deletion; add comments

[petar-dambovaliev]

Closes 3688

[Gno2D2]

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[gfanton]

This will definitely require a second look, probably @ltzmaxwell or @thehowl as I'm unsure of all the implications of switching to isDeleted. However, the comment left above isDeleted appears coherent.
Other comments on ObjectInfos properties bring clarity and are really helpful. Thanks for adding that.

[thehowl]

LGTM