Analysis API: rename KtCallableSymbol.type -> returnType

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

@@ -5,8 +5,8 @@ KtLocalVariableSymbol:
   name: loopVariable
   origin: SOURCE
   receiverType: null
+  returnType: kotlin/Int
   symbolKind: LOCAL
-  type: kotlin/Int
   deprecationStatus: null
 
 KtFunctionSymbol:
@@ -25,9 +25,9 @@ KtFunctionSymbol:
   name: usage
   origin: SOURCE
   receiverType: null
+  returnType: kotlin/Unit
   symbolKind: TOP_LEVEL
-  type: kotlin/Unit
   typeParameters: []
   valueParameters: []
   visibility: Public
-  deprecationStatus: null
+  deprecationStatus: null