Publication schema: add interactive sizing options

[ascholerChemeketa]

Adds publication schema items for new options in #2590

Heads up for @oscarlevin

[oscarlevin]

I don't think this is correct (or at least, I've not seen named elements used this way, so would rather not introduce a new pattern).

Maybe what you want is to just insert a named element InteractiveElements? and then define that to be

InteractiveElements =
  element geogebra {
    InteractiveAttributes
  } &
  element desmos {
    InteractiveAttributes
  } &
...

Where InteractiveAttributes = attribute resize-behavior { "fixed-height" | "responsive" }

Check out the section of common options.

[ascholerChemeketa]

OK, found something that seems to be valid and avoids the repetition that was driving me nuts.

Could also be condensed down to just

            Interactives =
                element interactives {
                    attribute resize-behavior { "fixed-height" | "responsive" }?,
                    element (
                        geogebra |
                        desmos |
                        calcplot3d |
                        circuitjs |
                        d3 |
                        doenetml |
                        iframe |
                        javascript |
                        jsxgraph |
                        sage
                    ) {
                        attribute resize-behavior { "fixed-height" | "responsive" }?
                    }*
                }

But that feels a little harder to read.