[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/calls/qualifiedCallInsideSuperCall5.txt

@@ -16,7 +16,7 @@ FILE: [ResolvedTo(IMPORTS)] qualifiedCallInsideSuperCall5.kt
             public [ResolvedTo(CONTRACTS)] [ContainingClassKey=A] get(): R|kotlin/String|
 
     }
-    public? final? [ResolvedTo(RAW_FIR)] object B : A {
+    public final? [ResolvedTo(RAW_FIR)] object B : A {
         private [ResolvedTo(RAW_FIR)] [ContainingClassKey=B] constructor(): R|B| {
             LAZY_super<A>
         }