K2: fix field annotation splitting and frontend checks

Related to KT-57135

compiler/fir/analysis-tests/testData/resolveWithStdlib/problems/FieldAnnotationWithClasses.kt

@@ -0,0 +1,15 @@
+// WITH_REFLECT
+
+import kotlin.reflect.*
+
+annotation class Ann(vararg val allowedTypes: KClass<*>)
+
+fun foo() {
+    class Local {
+        @field:Ann(allowedTypes = [Some::class, Other::class])
+        val x: Int = 42
+    }
+}
+
+class Some
+class Other