feat: always mark generated classes as final/sealed

Removes [finalize: bool] configuration parameter
and instead makes it the default.

Author: Yegair

packages/_internal/lib/models.dart

@@ -102,7 +102,6 @@ class Data with _$Data {
     required GenericsParameterTemplate genericsParameterTemplate,
     required bool shouldUseExtends,
     required bool genericArgumentFactories,
-    required bool shouldMarkSealedOrFinal,
   }) = _Data;
 }
 

packages/_internal/lib/models.freezed.dart

@@ -146,7 +146,6 @@ class FreezedGenerator extends ParserGenerator<GlobalData, Data, Freezed> {
       genericsParameterTemplate: GenericsParameterTemplate.fromGenericElement(
         declaration.declaredElement!.typeParameters,
       ),
-      shouldMarkSealedOrFinal: configs.finalize!,
     );
   }
 
@@ -599,11 +598,6 @@ class FreezedGenerator extends ParserGenerator<GlobalData, Data, Freezed> {
         orElse: () => _buildYamlConfigs.fromJson,
       ),
       addImplicitFinal: annotation.getField('addImplicitFinal')!.toBoolValue()!,
-      finalize: annotation.decodeField(
-        'finalize',
-        decode: (obj) => obj.toBoolValue(),
-        orElse: () => _buildYamlConfigs.finalize,
-      ),
       map: annotation.decodeField(
         'map',
         decode: (obj) {

packages/freezed/lib/src/freezed_generator.dart

@@ -92,7 +92,6 @@ class Data with _$Data {
     required GenericsParameterTemplate genericsParameterTemplate,
     required bool shouldUseExtends,
     required bool genericArgumentFactories,
-    required bool shouldMarkSealedOrFinal,
   }) = _Data;
 }
 

packages/freezed/lib/src/models.dart

@@ -64,7 +64,7 @@ ${copyWith?.concreteImpl(constructor.parameters) ?? ''}
 /// @nodoc
 $jsonSerializable
 ${constructor.decorators.join('\n')}
-${data.shouldMarkSealedOrFinal ? 'final' : ''} class $concreteName${data.genericsDefinitionTemplate} $_concreteSuper {
+final class $concreteName${data.genericsDefinitionTemplate} $_concreteSuper {
   $_concreteConstructor
 
   $_concreteFromJsonConstructor
@@ -86,7 +86,7 @@ $_toJson
 }
 
 
-${data.shouldMarkSealedOrFinal ? 'sealed' : 'abstract'} class ${constructor.redirectedName}${data.genericsDefinitionTemplate} $_superKeyword ${data.name}${data.genericsParameterTemplate}$interfaces {
+sealed class ${constructor.redirectedName}${data.genericsDefinitionTemplate} $_superKeyword ${data.name}${data.genericsParameterTemplate}$interfaces {
   $_isConst factory ${constructor.redirectedName}(${constructor.parameters.asExpandedDefinition}) = $concreteName${data.genericsParameterTemplate};
   $_privateConcreteConstructor