[FIR] Initialize public visibility for class-like declarations at FIR building phase if no modifier is presented

Java resolving subsystem requires calculated visibility for correct disambiguation of supertypes.
But visibility remains `Unknown` for Kotlin class-like declarations during supertypes resolving because `STATUS` resolve phase is performed after `SUPER_TYPES` phase.
To fix the problem, the visibility should be initialized to public at the FIR building phase if no modifier is presented.

^KT-64127 Fixed

analysis/low-level-api-fir/testData/contextCollector/simple.txt

@@ -39,7 +39,7 @@ FILE: [ResolvedTo(IMPORTS)] simple.kt
         }
 
     }
-    public? final? [ResolvedTo(RAW_FIR)] class Unrelated : R|kotlin/Any| {
+    public final? [ResolvedTo(RAW_FIR)] class Unrelated : R|kotlin/Any| {
         public? [ResolvedTo(RAW_FIR)] constructor(): R|foo/Unrelated| {
             LAZY_super<R|kotlin/Any|>
         }