[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

compiler/fir/raw-fir/psi2fir/testData/rawBuilder/declarations/script.txt

@@ -1,7 +1,7 @@
 FILE: script.kts
     SCRIPT: <script-script.kts>
 
-        public? final? class Builder : R|kotlin/Any| {
+        public final? class Builder : R|kotlin/Any| {
             public? [ContainingClassKey=Builder] constructor(): R|Builder| {
                 super<R|kotlin/Any|>()
             }
@@ -14,7 +14,7 @@ FILE: script.kts
                 println#(version#)
             }
 
-            public? final? class Nested : R|kotlin/Any| {
+            public final? class Nested : R|kotlin/Any| {
                 public? [ContainingClassKey=Nested] constructor(): R|Builder.Nested| {
                     super<R|kotlin/Any|>()
                 }