CASSANDRA-15254 Support updates on the virtuabl table SettingsTable (use annotations for property updates validation)

[Mmuzaf]

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[Mmuzaf]

@smiklosovic Thank you for the comments. Do you agree with the proposed solution design? Do you have any comments on that?

[smiklosovic]

@Mmuzaf I think you did a good job and David already saw it too so ... I may go through it next days again but seems robust enough to me! It would be nice to have yet another pair of eyes on this, if you happen to get somebody to take a look, that would be great!

[dcapwell]

Sorry, been away from this patch for a very long time. If 2 committers are +1 to this patch please don't wait for me and feel free to merge. I don't know when I will have time to review again.