[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/getOrBuildFir/declarations/ktij23263.txt

@@ -7,11 +7,11 @@ FIR element rendered:
 
 FIR FILE:
 FILE: [ResolvedTo(IMPORTS)] ktij23263.kt
-    public? final? [ResolvedTo(RAW_FIR)] class InitOrderDemo : R|kotlin/Any| {
+    public final? [ResolvedTo(RAW_FIR)] class InitOrderDemo : R|kotlin/Any| {
         public? [ResolvedTo(RAW_FIR)] [ContainingClassKey=InitOrderDemo] constructor([ResolvedTo(RAW_FIR)] name: String): R|InitOrderDemo| {
             LAZY_super<R|kotlin/Any|>
         }
 
         <ERROR PROPERTY: Destructuring declarations are only allowed for local variables/values>
 
-    }
+    }