[RelayCommand] source generator error with can't lowered first-char

[JamesCorl]

Describe the bug

[RelayCommand] attribute source generator error, for the function-name's first character can't be lowered.

Regression

No response

Steps to reproduce

1. A Dotnet6 project with MVVM toolkit 8.0.0 installed
2. A function with its name's first character can't be lowered, such as:

[RelayCommand]
private void 中文() {}
[RelayCommand]
private void c中文() {}

3. Build and see the error:CS0102 类型“MainViewModel”已经包含“中文Command”的定义.
4. Generated code snippet that causing the error:

partial class MainViewModel{
[global::System.CodeDom.Compiler.GeneratedCode("CommunityToolkit.Mvvm.SourceGenerators.RelayCommandGenerator", "8.0.0.0")]
private global::CommunityToolkit.Mvvm.Input.RelayCommand<bool?>? 中文Command;
[global::System.CodeDom.Compiler.GeneratedCode("CommunityToolkit.Mvvm.SourceGenerators.RelayCommandGenerator", "8.0.0.0")]
[global::System.Diagnostics.CodeAnalysis.ExcludeFromCodeCoverage]
public global::CommunityToolkit.Mvvm.Input.IRelayCommand<bool?> 中文Command => 中文Command ??= new global::CommunityToolkit.Mvvm.Input.RelayCommand<bool?>(new global::System.Action<bool?>(中文));
}

Expected behavior

No error, just like when the function name is changed to "C中文". Maybe it should use '_' to name the background field instead, because [ObservableProperty] works fine with "_中文". Expected generated code snippet:

partial class MainViewModel{
[global::System.CodeDom.Compiler.GeneratedCode("CommunityToolkit.Mvvm.SourceGenerators.RelayCommandGenerator", "8.0.0.0")]
private global::CommunityToolkit.Mvvm.Input.RelayCommand<bool?>? _中文Command;
[global::System.CodeDom.Compiler.GeneratedCode("CommunityToolkit.Mvvm.SourceGenerators.RelayCommandGenerator", "8.0.0.0")]
[global::System.Diagnostics.CodeAnalysis.ExcludeFromCodeCoverage]
public global::CommunityToolkit.Mvvm.Input.IRelayCommand<bool?> 中文Command => _中文Command ??= new global::CommunityToolkit.Mvvm.Input.RelayCommand<bool?>(new global::System.Action<bool?>(中文));
}

Screenshots

No response

IDE and version

VS 2022

IDE version

VS Community 2022 17.3.4

Nuget packages

• [ ] CommunityToolkit.Common
• [ ] CommunityToolkit.Diagnostics
• [ ] CommunityToolkit.HighPerformance
• [X] CommunityToolkit.Mvvm (aka MVVM Toolkit)

Nuget package version(s)

8.0.0

Additional context

No response

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