[IR] Filter chars and codePoints from allowed to interpret function

These two functions apparently are represented in Kotlin as methods
of `kotlin.String`. Because of that we accidentally treated them as
builtins.

To also minimize such cases, added filtration by return type. We are
allowing to interpret only these functions that have primitive or
unsigned return type.

#KT-57028 Fixed

compiler/ir/ir.interpreter/src/org/jetbrains/kotlin/ir/interpreter/checker/EvaluationMode.kt

@@ -51,7 +51,10 @@ enum class EvaluationMode(protected val mustCheckBody: Boolean) {
 
     ONLY_BUILTINS(mustCheckBody = false) {
         private val forbiddenMethodsOnPrimitives = setOf("inc", "dec", "rangeTo", "rangeUntil", "hashCode")
-        private val forbiddenMethodsOnStrings = setOf("subSequence", "hashCode", "<init>")
+        private val forbiddenMethodsOnStrings = setOf(
+            "subSequence", "hashCode", "<init>",
+            "chars", "codePoints" // from java.lang.CharSequence; they are represented as member declarations from "kotlin.String"
+        )
         private val allowedExtensionFunctions = setOf(
             "kotlin.floorDiv", "kotlin.mod", "kotlin.NumbersKt.floorDiv", "kotlin.NumbersKt.mod", "kotlin.<get-code>"
         )
@@ -65,6 +68,9 @@ enum class EvaluationMode(protected val mustCheckBody: Boolean) {
         override fun canEvaluateFunction(function: IrFunction, context: IrCall?): Boolean {
             if (function.property?.isConst == true) return true
 
+            val returnType = function.returnType
+            if (!returnType.isPrimitiveType() && !returnType.isString() && !returnType.isUnsignedType()) return false
+
             val fqName = function.fqNameWhenAvailable?.asString()
             val parent = function.parentClassOrNull
             val parentType = parent?.defaultType