[FE] Completely replace FunctionClassKind with FunctionalTypeKind

FunctionalTypeKind can be used in FE 1.0 too, so there is no need to
  keep both classes. Also, removal of FunctionClassKind simplifies work
  with FunctionalTypeKind in common code, like Analysis Api

compiler/fir/fir-deserialization/src/org/jetbrains/kotlin/fir/deserialization/FirTypeDeserializer.kt

@@ -5,7 +5,7 @@
 
 package org.jetbrains.kotlin.fir.deserialization
 
-import org.jetbrains.kotlin.builtins.functions.FunctionClassKind
+import org.jetbrains.kotlin.builtins.functions.FunctionalTypeKind
 import org.jetbrains.kotlin.fir.FirModuleData
 import org.jetbrains.kotlin.fir.computeTypeAttributes
 import org.jetbrains.kotlin.fir.declarations.FirDeclarationOrigin
@@ -202,7 +202,7 @@ class FirTypeDeserializer(
         val suspendReturnType = continuationType.typeArguments.single() as ConeKotlinTypeProjection
         val valueParameters = arguments.dropLast(2)
 
-        val kind = FunctionClassKind.SuspendFunction
+        val kind = FunctionalTypeKind.SuspendFunction
         return ConeClassLikeTypeImpl(
             ClassId(kind.packageFqName, kind.numberedClassName(valueParameters.size)).toLookupTag(),
             (valueParameters + suspendReturnType).toTypedArray(),
@@ -222,7 +222,7 @@ class FirTypeDeserializer(
                 1 -> {
                     val arity = arguments.size - 1
                     if (arity >= 0) {
-                        val kind = FunctionClassKind.SuspendFunction
+                        val kind = FunctionalTypeKind.SuspendFunction
                         ConeClassLikeTypeImpl(
                             ClassId(kind.packageFqName, kind.numberedClassName(arity)).toLookupTag(),
                             arguments,