fix missing ColumnPathCreation

Author: AndreiKingsley

core/src/main/kotlin/org/jetbrains/kotlinx/dataframe/documentation/ColumnPathCreation.kt

@@ -0,0 +1,8 @@
+package org.jetbrains.kotlinx.dataframe.documentation
+
+/**
+ * If the specified path is partially or fully missing — that is, if any segment of the path
+ * does not correspond to an existing column or column group — all missing parts will be created automatically.
+ */
+@ExcludeFromSources
+internal interface ColumnPathCreation