Analysis API: rename KtCallableSymbol.type -> returnType

analysis/analysis-api/testData/symbols/symbolByPsi/outerAndInnerClasses.txt

@@ -199,8 +199,8 @@ KtFunctionSymbol:
   name: foo
   origin: SOURCE
   receiverType: null
+  returnType: kotlin/Unit
   symbolKind: CLASS_MEMBER
-  type: kotlin/Unit
   typeParameters: [
     KtTypeParameterSymbol(T3)
   ]
@@ -230,4 +230,4 @@ KtNamedClassOrObjectSymbol:
     KtTypeParameterSymbol(T)
   ]
   visibility: Public
-  deprecationStatus: null
+  deprecationStatus: null