[psi] move frontend independent string manipulators to psi.main module

this way IDE can drop dependency to old frontend,
when it's actually redundant

compiler/psi/src/org/jetbrains/kotlin/psi/psiUtil/KtStringTemplateExpressionManipulator.kt

@@ -1,17 +1,6 @@
 /*
- * Copyright 2010-2015 JetBrains s.r.o.
+ * Copyright 2010-2023 JetBrains s.r.o. and Kotlin Programming Language contributors.
- *
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
  */
 
 package org.jetbrains.kotlin.psi.psiUtil

compiler/psi/src/org/jetbrains/kotlin/psi/psiUtil/StringTemplateExpressionManipulator.kt

@@ -1,17 +1,6 @@
 /*
- * Copyright 2010-2015 JetBrains s.r.o.
+ * Copyright 2010-2023 JetBrains s.r.o. and Kotlin Programming Language contributors.
- *
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
  */
 
 package org.jetbrains.kotlin.psi.psiUtil
@@ -21,6 +10,8 @@ import org.jetbrains.kotlin.psi.KtStringTemplateExpression
 import com.intellij.openapi.util.TextRange
 import org.jetbrains.kotlin.psi.KtPsiFactory
 import com.intellij.openapi.util.text.StringUtil
+import kotlin.jvm.java
+import kotlin.text.substring
 
 class StringTemplateExpressionManipulator : AbstractElementManipulator<KtStringTemplateExpression>() {
     override fun handleContentChange(