Support of custom 'equals' and 'hashCode' in inline classes

'equals' from any made available for overriding in inline classes
'typed' equals made available for definition in inline classes
'typed' equals definition made compulsory if 'untyped' is overridden
'operator' keyword is allowed in 'typed' equals definition

^KT-24874: Fixed

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

@@ -3876,6 +3876,13 @@ internal val KT_DIAGNOSTIC_CONVERTER = KtDiagnosticConverterBuilder.buildConvert
             token,
         )
     }
+    add(FirErrors.INEFFICIENT_EQUALS_OVERRIDING_IN_INLINE_CLASS) { firDiagnostic ->
+        InefficientEqualsOverridingInInlineClassImpl(
+            firDiagnostic.a,
+            firDiagnostic as KtPsiDiagnostic,
+            token,
+        )
+    }
     add(FirErrors.CANNOT_ALL_UNDER_IMPORT_FROM_SINGLETON) { firDiagnostic ->
         CannotAllUnderImportFromSingletonImpl(
             firDiagnostic.a,

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

@@ -2704,6 +2704,11 @@ sealed class KtFirDiagnostic<PSI : PsiElement> : KtDiagnosticWithPsi<PSI> {
         override val diagnosticClass get() = RedundantInlineSuspendFunctionType::class
     }
 
+    abstract class InefficientEqualsOverridingInInlineClass : KtFirDiagnostic<KtDeclaration>() {
+        override val diagnosticClass get() = InefficientEqualsOverridingInInlineClass::class
+        abstract val className: String
+    }
+
     abstract class CannotAllUnderImportFromSingleton : KtFirDiagnostic<KtImportDirective>() {
         override val diagnosticClass get() = CannotAllUnderImportFromSingleton::class
         abstract val objectName: Name

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

@@ -3261,6 +3261,12 @@ internal class RedundantInlineSuspendFunctionTypeImpl(
     override val token: KtLifetimeToken,
 ) : KtFirDiagnostic.RedundantInlineSuspendFunctionType(), KtAbstractFirDiagnostic<KtElement>
 
+internal class InefficientEqualsOverridingInInlineClassImpl(
+    override val className: String,
+    override val firDiagnostic: KtPsiDiagnostic,
+    override val token: KtLifetimeToken,
+) : KtFirDiagnostic.InefficientEqualsOverridingInInlineClass(), KtAbstractFirDiagnostic<KtDeclaration>
+
 internal class CannotAllUnderImportFromSingletonImpl(
     override val objectName: Name,
     override val firDiagnostic: KtPsiDiagnostic,