[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/annotations/superCallAnnotationScript.txt

@@ -18,7 +18,7 @@ FILE: [ResolvedTo(IMPORTS)] superCallAnnotationScript.kts
 
         }
 
-        public? open [ResolvedTo(SUPER_TYPES)] class A : R|kotlin/Any| {
+        public open [ResolvedTo(SUPER_TYPES)] class A : R|kotlin/Any| {
             public? [ResolvedTo(RAW_FIR)] [ContainingClassKey=A] constructor(): R|A| {
                 LAZY_super<R|kotlin/Any|>
             }