You can find the files in the subfolder “asl” of Krita’s resource folder, under Windows this would usually be “c:\Users\YOUR_WINDOWS_USERNAME\AppData\Roaming\krita\asl\”.
I can’t tell you if whole libraries of layerstyles can be created in Krita, I haven’t tried it yet. But Krita is able to handle Adobe’s ASL files, and if it’s a library it can call and use every single layerstyle.
It is not possible to include layerstyles in a bundle, you have to share them as single files or zipped in archives.
I hope I’ve understood your questions correctly, so if you wanted to know something beside that, I have to excuse my misinterpretation.