[FIR] Add toString to all type scopes

compiler/fir/providers/src/org/jetbrains/kotlin/fir/scopes/impl/FirClassSubstitutionScope.kt

@@ -347,6 +347,10 @@ class FirClassSubstitutionScope(
     override fun getClassifierNames(): Set<Name> {
         return useSiteMemberScope.getClassifierNames()
     }
+
+    override fun toString(): String {
+        return "Substitution scope for [$useSiteMemberScope] for type $dispatchReceiverTypeForSubstitutedMembers"
+    }
 }
 
 class FirSubstitutionOverrideStorage(val session: FirSession) : FirSessionComponent {

compiler/fir/providers/src/org/jetbrains/kotlin/fir/scopes/impl/FirClassUseSiteMemberScope.kt

@@ -55,4 +55,8 @@ class FirClassUseSiteMemberScope(
         }
         return result
     }
+
+    override fun toString(): String {
+        return "Use site scope of $classId"
+    }
 }

compiler/fir/providers/src/org/jetbrains/kotlin/fir/scopes/impl/FirScopeWithFakeOverrideTypeCalculator.kt

@@ -83,4 +83,8 @@ class FirScopeWithFakeOverrideTypeCalculator(
 
     override val scopeOwnerLookupNames: List<String>
         get() = delegate.scopeOwnerLookupNames
+
+    override fun toString(): String {
+        return delegate.toString()
+    }
 }

compiler/fir/providers/src/org/jetbrains/kotlin/fir/scopes/impl/FirTypeIntersectionScope.kt

@@ -127,6 +127,10 @@ class FirTypeIntersectionScope private constructor(
         return scopes.flatMapTo(hashSetOf()) { it.getClassifierNames() }
     }
 
+    override fun toString(): String {
+        return "Intersection of [${scopes.joinToString(", ")}]"
+    }
+
     companion object {
         fun prepareIntersectionScope(
             session: FirSession,