Remove TraversePropertiesDsl from top-level toDataFrame {} operation

[Copilot]

Top-level preserve() / exclude() calls inside toDataFrame {} had broken semantics: they were supposed to apply to all properties {} blocks but did not work reliably, and calling them without any properties {} block produced an empty DataFrame. The compiler plugin also never supported this notation.

Changes

• CreateDataFrameDsl<T> no longer extends TraversePropertiesDsl — exclude() and preserve() are no longer directly available at the top level of toDataFrame {}
• CreateDataFrameDslImpl — removed TraversePropertiesDsl by configuration delegation
• Deprecated shims — exclude(), preserve(), and preserve<T>() are kept on CreateDataFrameDsl with DeprecationLevel.WARNING (→ ERROR in 1.1), forwarding to a properties {} block to ease migration
• Binary API — updated via apiDump; methods remain in bytecode for binary compatibility

Migration

// Before (broken — top-level preserve silently ignored without properties())
toDataFrame {
    preserve(DataFrame::class)
}

// Before (confusing — top-level preserve applied to all properties blocks)
toDataFrame {
    preserve(DataFrame::class)
    properties()
}

// After (correct)
toDataFrame {
    properties(maxDepth = Int.MAX_VALUE) {
        preserve(DataFrame::class)
    }
}

• Fixes Remove TraversePropertiesDsl from top-level toDataFrame {} operation #1857