[AA] KT-56617 Build FirClassSymbols for Java classes lazily

- Some completion performance tests (e.g. IntelliJ: "empty place typing
  with library cache") spent a considerable amount of time in
  `KtFirSymbolProviderByJavaPsi.getNamedClassSymbol`.
- This commit introduces `KtFirPsiJavaClassSymbol`, which implements
  many `KtNamedClassOrObjectSymbol` properties with the `PsiClass`
  instead of the FIR class. The `FirClassSymbol` is built only when
  necessary. This improves performance when no "slow" properties need to
  be computed for the symbol.

^KT-56617 fixed

compiler/fir/java/src/org/jetbrains/kotlin/fir/java/JavaUtils.kt

@@ -34,7 +34,7 @@ internal val JavaModifierListOwner.modality: Modality
         else -> Modality.OPEN
     }
 
-internal val JavaClass.modality: Modality
+val JavaClass.modality: Modality
     get() = when {
         isAnnotationType || isEnum -> Modality.FINAL
         isSealed -> Modality.SEALED
@@ -43,7 +43,7 @@ internal val JavaClass.modality: Modality
         else -> Modality.OPEN
     }
 
-internal val JavaClass.classKind: ClassKind
+val JavaClass.classKind: ClassKind
     get() = when {
         isAnnotationType -> ClassKind.ANNOTATION_CLASS
         isInterface -> ClassKind.INTERFACE