Automatically change the names of properties to be mapped to UpperCaseSnakeCase

[MrDave1999]

The documentation mentions:

The EnvKey attribute is used in case the key names do not match the properties and this is because the key names in a .env file usually follow this convention: KEY_NAME=VALUE (UpperCase + SnakeCase).

It would be great if the library would automatically convert the names of the properties to be mapped to UpperCaseSnakeCase without the need to use the EnvKey attribute. In this way, it would no longer be necessary to manually add the EnvKey decorator in each property of the AppSettings class.

PD: No conversion is performed when using the EnvKey decorator.