[Feature Request] Handling duplicate file names

[orestesgaolin]

Sometimes it happens that for compatibility I need to use .png and .svg file with the same name e.g. splash.svg and splash.png.

It would be awesome to automatically generate different field names for these files e.g. splash_svg and splash_png.

[lcdsmao]

In the next release, if files have the same base name but the different extension will be handled properly.
For example:

flutter_gen/test_resources/actual_data/assets_camel_case.gen.dart

Lines 24 to 27 in 33e0a6c

	static const AssetGenImage imagesProfileJpg =
	AssetGenImage('assets/images/profile.jpg');
	static const AssetGenImage imagesProfilePng =
	AssetGenImage('assets/images/profile.png');