DM-54862: Enable ExtendednessTool-like behavior

[arunkannawadi]

for backward compatibility. This introduces the deprecation that was missed in #478 .

[taranu]

It may be better to re-introduce parametrizedBand as a Field for now.

Either way, my main comment is that I missed doing the same thing for ColumnMagnitudeScatterPlot, also in atools. That's the last remaining "use" of ExtendednessTool, so it could be deprecated after that. Since you've already made the removal, I figure it would be better to at least get rid of all uses of it on this ticket. I can add the commit to do that if you like.

Arguably deprecating ExtendednessTool itself should be another ticket and/or trivial RFC, since it is a public interface - up to you, I suppose.

[arunkannawadi]

@taranu I've made the changes in ColumnMagnitudeScatterPlot. I decided against reintroducing these as Field instances again: as config fields, they'd be persisted, regardless of their deprecation status, and given that they were removed, reintroducing them seems a step backwards to me. They are now as close as they can be to what they would become after removal - a class attribute.

As for deprecating ExtendednessTool itself, I'll leave that up to you.