FIR IDE: Remove typesCache from KtSymbolByFirBuilder

This cache wasn't working too well, because ConeTypes have
equals/hashCode implementations which do not account for types'
attributes (like annotations, for example).

Because of that, `String` and `@Annotated String` were considered the
same type, and the cache was remembering whichever came first.

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

@@ -149,9 +149,9 @@ KtFunctionSymbol:
   origin: SOURCE
   receiverType: null
   returnType: [
-    Anno2()
+    Anno3()
       psi: KtAnnotationEntry
-  ] @R|Anno2|()  I
+  ] @R|Anno3|()  I
   symbolKind: CLASS_MEMBER
   typeParameters: []
   valueParameters: [
@@ -182,9 +182,9 @@ KtKotlinPropertySymbol:
   origin: SOURCE
   receiverType: null
   returnType: [
-    Anno2()
+    Anno4()
       psi: KtAnnotationEntry
-  ] @R|Anno2|()  I
+  ] @R|Anno4|()  I
   setter: null
   symbolKind: CLASS_MEMBER
   typeParameters: []
@@ -211,9 +211,9 @@ KtNamedClassOrObjectSymbol:
   origin: SOURCE
   superTypes: [
     [
-      Anno2()
+      Anno1()
         psi: KtAnnotationEntry
-    ] @R|Anno2|()  I
+    ] @R|Anno1|()  I
   ]
   symbolKind: TOP_LEVEL
   typeParameters: []