[AA] delegate to resolveToFirSymbol to avoid decompilation

`getReturnTypeForKtDeclaration` is called by UAST on probably compiled declarations.
In order to avoid redundant decompilation + building raw FIR + resolve,
let's delegate to deserialized FIR which is already prepared in stubs

Fixes KTIJ-24810

When `findSourceNonLocalFirDeclaration` is called on non-physical property accessor e.g.,
during completion, then traverse tree should allow drilling into FirProperty;
otherwise, no FIR would be found

analysis/analysis-api/testData/types/byDeclarationReturnType/anonymousFunction.kt

@@ -0,0 +1,3 @@
+fun foo() {
+    val f = fun<caret>(it: String) {}
+}

analysis/analysis-api/testData/types/byDeclarationReturnType/anonymousFunction.txt

@@ -0,0 +1,11 @@
+annotationsList: []
+classId: kotlin/Unit
+classSymbol: KtNamedClassOrObjectSymbol(kotlin/Unit)
+nullability: NON_NULLABLE
+ownTypeArguments: []
+qualifiers: [
+  qualifier:
+    name: Unit
+    symbol: KtNamedClassOrObjectSymbol(kotlin/Unit)
+    typeArguments: []
+]