[FIR] Add checker for EXPANSIVE_INHERITANCE

^KT-59402 Fixed

analysis/analysis-api-fir/src/org/jetbrains/kotlin/analysis/api/fir/KtSymbolByFirBuilder.kt

@@ -461,8 +461,7 @@ internal class KtSymbolByFirBuilder constructor(
                     // TODO this is a temporary hack to prevent FIR IDE from crashing on builder inference, see KT-50916
                     val typeVariable = coneType.constructor.variable as? ConeTypeParameterBasedTypeVariable
                     val typeParameterSymbol = typeVariable?.typeParameterSymbol ?: throwUnexpectedElementError(coneType)
-                    val coneTypeParameterType = (typeParameterSymbol.toConeType() as ConeTypeParameterType)
-                        .withNullability(coneType.nullability, rootSession.typeContext)
+                    val coneTypeParameterType = typeParameterSymbol.toConeType(coneType.nullability.isNullable)
 
                     KtFirTypeParameterType(coneTypeParameterType, this@KtSymbolByFirBuilder)
                 }

analysis/analysis-api-fir/src/org/jetbrains/kotlin/analysis/api/fir/diagnostics/KtFirDataClassConverters.kt

@@ -2427,6 +2427,21 @@ internal val KT_DIAGNOSTIC_CONVERTER = KtDiagnosticConverterBuilder.buildConvert
             token,
         )
     }
+    add(FirErrors.EXPANSIVE_INHERITANCE) { firDiagnostic ->
+        ExpansiveInheritanceImpl(
+            firDiagnostic as KtPsiDiagnostic,
+            token,
+        )
+    }
+    add(FirErrors.EXPANSIVE_INHERITANCE_IN_JAVA) { firDiagnostic ->
+        ExpansiveInheritanceInJavaImpl(
+            firDiagnostic.a.map { firBasedSymbol ->
+                firSymbolBuilder.buildSymbol(firBasedSymbol)
+            },
+            firDiagnostic as KtPsiDiagnostic,
+            token,
+        )
+    }
     add(FirErrors.DEPRECATED_TYPE_PARAMETER_SYNTAX) { firDiagnostic ->
         DeprecatedTypeParameterSyntaxImpl(
             firDiagnostic as KtPsiDiagnostic,

analysis/analysis-api-fir/src/org/jetbrains/kotlin/analysis/api/fir/diagnostics/KtFirDiagnostics.kt

@@ -1723,6 +1723,15 @@ sealed interface KtFirDiagnostic<PSI : PsiElement> : KtDiagnosticWithPsi<PSI> {
         val containingTypes: List<KtSymbol>
     }
 
+    interface ExpansiveInheritance : KtFirDiagnostic<PsiElement> {
+        override val diagnosticClass get() = ExpansiveInheritance::class
+    }
+
+    interface ExpansiveInheritanceInJava : KtFirDiagnostic<PsiElement> {
+        override val diagnosticClass get() = ExpansiveInheritanceInJava::class
+        val containingTypes: List<KtSymbol>
+    }
+
     interface DeprecatedTypeParameterSyntax : KtFirDiagnostic<KtDeclaration> {
         override val diagnosticClass get() = DeprecatedTypeParameterSyntax::class
     }

analysis/analysis-api-fir/src/org/jetbrains/kotlin/analysis/api/fir/diagnostics/KtFirDiagnosticsImpl.kt

@@ -2072,6 +2072,17 @@ internal class FiniteBoundsViolationInJavaImpl(
     token: KtLifetimeToken,
 ) : KtAbstractFirDiagnostic<PsiElement>(firDiagnostic, token), KtFirDiagnostic.FiniteBoundsViolationInJava
 
+internal class ExpansiveInheritanceImpl(
+    firDiagnostic: KtPsiDiagnostic,
+    token: KtLifetimeToken,
+) : KtAbstractFirDiagnostic<PsiElement>(firDiagnostic, token), KtFirDiagnostic.ExpansiveInheritance
+
+internal class ExpansiveInheritanceInJavaImpl(
+    override val containingTypes: List<KtSymbol>,
+    firDiagnostic: KtPsiDiagnostic,
+    token: KtLifetimeToken,
+) : KtAbstractFirDiagnostic<PsiElement>(firDiagnostic, token), KtFirDiagnostic.ExpansiveInheritanceInJava
+
 internal class DeprecatedTypeParameterSyntaxImpl(
     firDiagnostic: KtPsiDiagnostic,
     token: KtLifetimeToken,