Support Rtl in SplitPane (#4265)

This is related to issue:
#4258

changes
- DesktopSplitPane.kt: placable.place() -> placable.placeRelative

- SplitePaneDSL.kt: change the delta direction to follow the layout
direction
```kotlin
 @composable
    override fun Modifier.markAsHandle(): Modifier = this.run {
        val layoutDirection = LocalLayoutDirection.current
        pointerInput(containerScope.splitPaneState) {
            detectDragGestures { change, _ ->
                change.consume()
                containerScope.splitPaneState.dispatchRawMovement(
                    if (containerScope.isHorizontal)
                        if (layoutDirection == LayoutDirection.Ltr) change.position.x else -change.position.x
                    else change.position.y
                )
            }
        }
```

the problem with .onPointerEvent() Modifier, or onDrag also,  is
    whenever the layout direction is Ltr or Rtl:
moving to right always produce positive change, [expected negative if
dir =Rtl]
moving to left always produce negative change, [expected positive if dir
=Rtl]

the calculation of postion will fail if layoutDir is Rtl, because
positionPercentage will be out of range
```kotlin
fun dispatchRawMovement(delta: Float) {
        val movableArea = maxPosition - minPosition
        if (movableArea > 0) {
            positionPercentage =
                ((movableArea * positionPercentage) + delta).coerceIn(0f, movableArea) / movableArea
        }
    }
```

components/SplitPane/library/src/commonMain/kotlin/org/jetbrains/compose/splitpane/SplitPaneDSL.kt

@@ -4,8 +4,11 @@ import androidx.compose.foundation.gestures.detectDragGestures
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.remember
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.composed
 import androidx.compose.ui.input.pointer.pointerInput
+import androidx.compose.ui.platform.LocalLayoutDirection
 import androidx.compose.ui.unit.Dp
+import androidx.compose.ui.unit.LayoutDirection
 import androidx.compose.ui.unit.dp
 
 /** Receiver scope which is used by [HorizontalSplitPane] and [VerticalSplitPane] */
@@ -83,12 +86,17 @@ interface SplitterScope {
 internal class HandleScopeImpl(
     private val containerScope: SplitPaneScopeImpl
 ) : HandleScope {
-    override fun Modifier.markAsHandle(): Modifier = this.pointerInput(containerScope.splitPaneState) {
-        detectDragGestures { change, _ ->
-            change.consume()
-            containerScope.splitPaneState.dispatchRawMovement(
-                if (containerScope.isHorizontal) change.position.x else change.position.y
-            )
+    override fun Modifier.markAsHandle(): Modifier = composed {
+        val layoutDirection = LocalLayoutDirection.current
+        pointerInput(containerScope.splitPaneState) {
+            detectDragGestures { change, _ ->
+                change.consume()
+                containerScope.splitPaneState.dispatchRawMovement(
+                    if (containerScope.isHorizontal)
+                        if (layoutDirection == LayoutDirection.Ltr) change.position.x else -change.position.x
+                    else change.position.y
+                )
+            }
         }
     }
 }

components/SplitPane/library/src/desktopMain/kotlin/org/jetbrains/compose/splitpane/DesktopSplitPane.kt

@@ -121,18 +121,18 @@ internal actual fun SplitPane(
                 }
 
                 layout(constraints.maxWidth, constraints.maxHeight) {
-                    firstPlaceable.place(0, 0)
+                    firstPlaceable.placeRelative(0, 0)
                     if (isHorizontal) {
-                        secondPlaceable.place(secondPlaceablePosition, 0)
-                        splitterPlaceable.place(position, 0)
+                        secondPlaceable.placeRelative(secondPlaceablePosition, 0)
+                        splitterPlaceable.placeRelative(position, 0)
                         if (moveEnabled) {
-                            handlePlaceable.place(handlePosition, 0)
+                            handlePlaceable.placeRelative(handlePosition, 0)
                         }
                     } else {
-                        secondPlaceable.place(0, secondPlaceablePosition)
-                        splitterPlaceable.place(0, position)
+                        secondPlaceable.placeRelative(0, secondPlaceablePosition)
+                        splitterPlaceable.placeRelative(0, position)
                         if (moveEnabled) {
-                            handlePlaceable.place(0, handlePosition)
+                            handlePlaceable.placeRelative(0, handlePosition)
                         }
                     }
                 }

components/SplitPane/library/src/desktopMain/kotlin/org/jetbrains/compose/splitpane/DesktopSplitter.kt

@@ -6,6 +6,8 @@ import androidx.compose.runtime.Composable
 import androidx.compose.ui.ExperimentalComposeUiApi
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.input.pointer.*
+import androidx.compose.ui.platform.LocalLayoutDirection
+import androidx.compose.ui.unit.LayoutDirection
 import androidx.compose.ui.unit.dp
 import java.awt.Cursor
 
@@ -20,12 +22,17 @@ private fun DesktopHandle(
     splitPaneState: SplitPaneState
 ) = Box(
     Modifier
-        .pointerInput(splitPaneState) {
-            detectDragGestures { change, _ ->
-                change.consumeAllChanges()
-                splitPaneState.dispatchRawMovement(
-                    if (isHorizontal) change.position.x else change.position.y
-                )
+        .run {
+            val layoutDirection = LocalLayoutDirection.current
+            pointerInput(splitPaneState) {
+                detectDragGestures { change, _ ->
+                    change.consume()
+                    splitPaneState.dispatchRawMovement(
+                        if (isHorizontal)
+                            if (layoutDirection == LayoutDirection.Ltr) change.position.x else -change.position.x
+                        else change.position.y
+                    )
+                }
             }
         }
         .cursorForHorizontalResize(isHorizontal)