chore: Adding sealed keyword to classes (#191)

Author: askpt

src/OpenFeature/Model/ClientMetadata.cs

@@ -3,7 +3,7 @@ namespace OpenFeature.Model
     /// <summary>
     /// Represents the client metadata
     /// </summary>
-    public class ClientMetadata : Metadata
+    public sealed class ClientMetadata : Metadata
     {
         /// <summary>
         /// Version of the client

src/OpenFeature/Model/FlagEvaluationDetails.cs

@@ -7,7 +7,7 @@ namespace OpenFeature.Model
     /// </summary>
     /// <typeparam name="T">Flag value type</typeparam>
     /// <seealso href="https://github.com/open-feature/spec/blob/v0.5.2/specification/types.md#evaluation-details"/>
-    public class FlagEvaluationDetails<T>
+    public sealed class FlagEvaluationDetails<T>
     {
         /// <summary>
         /// Feature flag evaluated value

src/OpenFeature/Model/FlagEvaluationOptions.cs

@@ -7,7 +7,7 @@ namespace OpenFeature.Model
     /// The hook and hook hints are added to the list of hooks called during the evaluation process
     /// </summary>
     /// <seealso href="https://github.com/open-feature/spec/blob/v0.5.2/specification/types.md#evaluation-options">Flag Evaluation Options</seealso>
-    public class FlagEvaluationOptions
+    public sealed class FlagEvaluationOptions
     {
         /// <summary>
         /// A immutable list of <see cref="Hook"/>

src/OpenFeature/Model/HookContext.cs

@@ -8,7 +8,7 @@ namespace OpenFeature.Model
     /// </summary>
     /// <typeparam name="T">Flag value type</typeparam>
     /// <seealso href="https://github.com/open-feature/spec/blob/v0.5.2/specification/sections/04-hooks.md#41-hook-context"/>
-    public class HookContext<T>
+    public sealed class HookContext<T>
     {
         /// <summary>
         /// Feature flag being evaluated

src/OpenFeature/Model/ResolutionDetails.cs

@@ -8,7 +8,7 @@ namespace OpenFeature.Model
     /// </summary>
     /// <typeparam name="T">Flag value type</typeparam>
     /// <seealso href="https://github.com/open-feature/spec/blob/v0.5.2/specification/types.md#resolution-details"/>
-    public class ResolutionDetails<T>
+    public sealed class ResolutionDetails<T>
     {
         /// <summary>
         /// Feature flag evaluated value

src/OpenFeature/NoOpProvider.cs

@@ -4,7 +4,7 @@
 
 namespace OpenFeature
 {
-    internal class NoOpFeatureProvider : FeatureProvider
+    internal sealed class NoOpFeatureProvider : FeatureProvider
     {
         private readonly Metadata _metadata = new Metadata(NoOpProvider.NoOpProviderName);
 

src/OpenFeature/ProviderRepository.cs

@@ -12,7 +12,7 @@ namespace OpenFeature
     /// <summary>
     /// This class manages the collection of providers, both default and named, contained by the API.
     /// </summary>
-    internal class ProviderRepository
+    internal sealed class ProviderRepository
     {
         private FeatureProvider _defaultProvider = new NoOpFeatureProvider();