SpaceViewBlueprint is now python serializable

[Wumpf]

What

Plus the usual amount of plumbing, following overall similar patterns than the previous PRs in this area

• Sister PR to Introduce python serialization for ContainerBlueprint #5390
• Part of V2 Blueprint APIs for Python #4167

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[jleibs]

This will need to get fixed in merge.

[jleibs]

FYI, zip_longest appears to lead to mypy lint errors. In my PR I had to add:

        container_kind = cast(ContainerKindLike, container_kind)
        display_name = cast(Optional[Utf8Like], display_name)
        contents = cast(Optional[EntityPathArrayLike], contents)
        col_shares = cast(Optional[ColumnShareArrayLike], col_shares)
        row_shares = cast(Optional[RowShareArrayLike], row_shares)
        active_tab = cast(Optional[EntityPathLike], active_tab)
        visible = cast(Optional[VisibleLike], visible)
        grid_columns = cast(Optional[GridColumnsLike], grid_columns)

to fix it 😭