[gradle] Generate method to create drawable or font resource accessors by a file path.

[terrakok]

Now we can get resource accessors by the path.

Icon(
  painterResource(Res.drawable.byPath("drawable/my_icon.xml")),
  contentDescription = null
)

The new API doesn't work with qualifiers and environment. It associates a concrete file with a new resource instance.
If there are two icons: drawable-night/my_icon.xml and drawable-light/my_icon.xml, users are supposed to select a right icon by their own.

It doesn't work for strings resources. There is no a such thing as a full qualified key for the string in a text representation. (as path for other resource types) We need to combine an xml file path + key inside. It is not what we want.

I understand that someone would like to have something like a runtime search in their string resources based on a string key and a current environment but it is a huge performance problem. That's why we converted XML files to the internal format and use generated classes instead. To iterate by files in the runtime is not possible.

Note: there is a way to generate a special map: key -> value and use for the search but it requires more resources to maintain it then brings a profit.

So, for the case it's possible to save strings to the regular txt file and read it as string on app's side.

Fixes #4880

Release Notes

Features - Resources

• Generate method to create drawable or font resource accessors by a file path.

[terrakok]

After an internal discussion we agreed that the right way is to add utility functions to convert ByteArrays to ImageBitmap/XmlElement/SvgElement in the compose core library.

#4925

To use strings as keys for resources is different story and will be discussed separately.