resources generate images support

Is your feature request related to a problem? Please describe.

When adding a new image resource to your project, it would be handy to be able to add one without going through https://images.nativescript.rocks/ or manually creating your own and placing them in the right folders.

Describe the solution you'd like

An extension of the resources generate command could be used that would act almost identically to the generate icons command, however it would use the original file name instead of "icon" when creating the different image sizes.

Describe alternatives you've considered

Making the generate icons command take another (optional) argument which allows an output name to be specified would also solve this issue

Anything else?

No response

Please accept these terms

• I have searched the existing issues as well as StackOverflow and this has not been posted before
• I agree to follow this project's Code of Conduct

首先定位 resources generate 命令及其现有的图标生成实现。扩展该命令，以使用原始文件名生成图像尺寸，或支持可选的输出名称；当无需外部工具或手动放置到文件夹中即可生成新的图像资源时，即视为完成。