增强 ValueMapper 类型

[tint]

Describe the feature

我希望通过 ValueMapper 来增强配置值，比如：

• 环境变量，${variable}、${variable||default}、${variable??default}；
• 值引用：%{key}、%{section.key}、%{key||default}、%{key??default}；
• 其它

Describe the solution you'd like

我需要再 ValueMapper 中获取 ini.Key、ini.Section 和 ini.File 实例

Describe alternatives you've considered

增强 ValueMapper 的能力

Additional context

No response

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