Inline ColumnFilter typealias in public API function signatures

[Copilot]

ColumnFilter<T> is a trivial single-use alias for (ColumnWithPath<T>) -> Boolean. IDE autocomplete was showing it as ColumnFilter<*> /* = (ColumnWithPath<*>) -> Boolean */ — noisier than just the expanded type. Aliases where the type parameter appears twice (e.g. RowExpression<T, R>, ColumnsSelector<T, C>) are left intact as they carry structural information.

Changes

• 12 public API files (cols, colsAtAnyDepth, colsInGroups, colsOf, colsOfKind, all, drop, filter, first, last, single, take): replaced ColumnFilter<C> / ColumnFilter<*> parameter types with (ColumnWithPath<C>) -> Boolean / (ColumnWithPath<*>) -> Boolean in public function signatures only.
• Internal functions keep using ColumnFilter — the typealias is preserved and internal casts (predicate as ColumnFilter<*>) are unchanged.
• KDoc references to [ColumnFilter] are retained for documentation.
• Added import org.jetbrains.kotlinx.dataframe.columns.ColumnWithPath to files that didn't already have it.
• Generated sources (core/generated-sources/) regenerated via ./gradlew :core:processKDocsMain.

Before:

public fun ColumnsSelectionDsl<*>.last(condition: ColumnFilter<*> = { true }): SingleColumn<*>
// shown in IDE as: condition: ColumnFilter<*> /* = (ColumnWithPath<*>) -> Boolean */

After:

public fun ColumnsSelectionDsl<*>.last(condition: (ColumnWithPath<*>) -> Boolean = { true }): SingleColumn<*>

• Fixes Inline ColumnFilter typealias in public API #1699

[Jolanrensen]

Copilot made a mess... I'll solve it manually

[Jolanrensen]

Okay, ColumnFilter is inlined in all public functions now. However, it's still mentioned a lot in KDocs and grammars. What should we do about that? @AndreiKingsley @koperagen

[koperagen]

Okay, ColumnFilter is inlined in all public functions now. However, it's still mentioned a lot in KDocs and grammars. What should we do about that? @AndreiKingsley @koperagen

We can keep them

[Jolanrensen]