Remove ElsaClient and related interfaces

Files ElsaClient.cs, IElsaClient.cs and IElsaClientFactory.cs have been deleted from the Elsa.Api.Client project. The commit also includes an update in the DependencyInjectionExtensions.cs file where IElsaClient service registration is removed, reflecting these changes.

src/clients/Elsa.Api.Client/Extensions/DependencyInjectionExtensions.cs

@@ -1,6 +1,5 @@
 using System.Text.Json;
 using System.Text.Json.Serialization;
-using Elsa.Api.Client.Contracts;
 using Elsa.Api.Client.Converters;
 using Elsa.Api.Client.HttpMessageHandlers;
 using Elsa.Api.Client.Options;
@@ -17,7 +16,6 @@
 using Elsa.Api.Client.Resources.WorkflowDefinitions.Contracts;
 using Elsa.Api.Client.Resources.WorkflowExecutionContexts.Contracts;
 using Elsa.Api.Client.Resources.WorkflowInstances.Contracts;
-using Elsa.Api.Client.Services;
 using JetBrains.Annotations;
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.Options;
@@ -66,7 +64,6 @@ public static IServiceCollection AddElsaClient(this IServiceCollection services,
         configureBuilderOptions?.Invoke(builderOptions);
 
         services.Configure(configureOptions ?? (_ => { }));
-        services.AddScoped<IElsaClient, ElsaClient>();
         services.AddApi<IWorkflowDefinitionsApi>(builderOptions);
         services.AddApi<IWorkflowInstancesApi>(builderOptions);
         services.AddApi<IActivityDescriptorsApi>(builderOptions);