Split support for Android API 21 and 23

app/src/minApi23/java/io/nekohasekai/sfa/compat/LazyItemModifiers.kt

@@ -0,0 +1,10 @@
+package io.nekohasekai.sfa.compat
+
+import androidx.compose.animation.core.FiniteAnimationSpec
+import androidx.compose.foundation.lazy.LazyItemScope
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.unit.IntOffset
+
+fun LazyItemScope.animateItemCompat(
+    placementSpec: FiniteAnimationSpec<IntOffset>,
+): Modifier = Modifier.animateItem(placementSpec = placementSpec)