Furion.ViewEngine.ViewEngineTemplate.SaveToFileAsync 的 bufferSize 能不能设置大一些？

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### Furion 版本号

2.13.0
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### 描述你的问题

我用的mac版本vs开发的，代码生成的时候报错:Cannot access a closed file.
进过多次尝试后发现将

```
        /// <summary>
        /// 保存到文件
        /// </summary>
        /// <param name="fileName"></param>
        /// <returns></returns>
        public Task SaveToFileAsync(string fileName)
        {
            using var fileStream = new FileStream(
                path: Penetrates.GetTemplateFileName(fileName),
                mode: FileMode.OpenOrCreate,
                access: FileAccess.Write,
                share: FileShare.None,
                bufferSize: 4096,
                useAsync: true);

return assemblyByteCode.CopyToAsync(fileStream);
        }
```
中的bufferSize修改到409600，后这个问题就解决了。

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### 异常堆栈信息

```
【时间】2021-07-14 11:00:25,572
【等级】ERR
【消息】System.ObjectDisposedException: Cannot access a closed file.
   at System.IO.FileStream.PrepareForWriting()
   at System.IO.FileStream.WriteSpan(ReadOnlySpan`1 source)
   at System.IO.FileStream.<>c.<WriteAsyncInternal>b__110_0(Task t, Object s)
   at System.Threading.Tasks.ContinuationTaskFromTask.InnerInvoke()
   at System.Threading.Tasks.Task.<>c.<.cctor>b__277_0(Object obj)
   at System.Threading.ExecutionContext.RunFromThreadPoolDispatchLoop(Thread threadPoolThread, ExecutionContext executionContext, ContextCallback callback, Object state)
--- End of stack trace from previous location ---
   at System.Threading.ExecutionContext.RunFromThreadPoolDispatchLoop(Thread threadPoolThread, ExecutionContext executionContext, ContextCallback callback, Object state)
   at System.Threading.Tasks.Task.ExecuteWithThreadLocal(Task& currentTaskSlot, Thread threadPoolThread)
--- End of stack trace from previous location ---
   at Furion.ViewEngine.ViewEngineTemplate.SaveToFile(String fileName) in /Users/doublestone/UED-Project-Code/Admin.Net.SqlSugar/Furion.Pure/ViewEngine/Templates/ViewEngineTemplate.cs:line 75
   at Furion.ViewEngine.ViewEngine.RunCompileFromCached(String content, Object model, String cacheFileName, Action`1 builderAction) in /Users/doublestone/UED-Project-Code/Admin.Net.SqlSugar/Furion.Pure/ViewEngine/Engines/ViewEngine.cs:line 119
   at Magic.Core.Service.CodeGen.CodeGenService.RunLocal(SysCodeGen input) in /Users/doublestone/UED-Project-Code/Admin.Net.SqlSugar/Magic.Core/Service/CodeGen/CodeGenService.cs:line 218
   at lambda_method25(Closure , Object )
   at Microsoft.AspNetCore.Mvc.Infrastructure.ActionMethodExecutor.AwaitableResultExecutor.Execute(IActionResultTypeMapper mapper, ObjectMethodExecutor executor, Object controller, Object[] arguments)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.<InvokeActionMethodAsync>g__Logged|12_1(ControllerActionInvoker invoker)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.<InvokeNextActionFilterAsync>g__Awaited|10_0(ControllerActionInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Rethrow(ActionExecutedContextSealed context)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.InvokeInnerFilterAsync()
--- End of stack trace from previous location ---
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeNextExceptionFilterAsync>g__Awaited|25_0(ResourceInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)
```
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### 代码或代码仓库

什么代码导致？

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### 数据库信息

- [ ] Mysql

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### 期待结果

期待的结果是？

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GVP dotNET China/Furion

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GVPdotNET China/Furion

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