Auto Completion does not work on grade field

[Ignavar]

I don't get auto complete suggestions for the grade field inside snapcraft.yaml.

Steps To Reproduce:

1. Create or edit a valid snapcraft.yaml file
2. Add or go the grade field, type to trigger auto complete
3. Expected values should be stable, devel
4. Instead i get an empty auto complete

Auto complete works correctly for other fields, for example i get correct suggestions classic, devmode and strict for the confinement field.

The issue likely happens because get_completion_items_from_path does not check inside anyOf or oneOf fields for presence of child keys hence grade which has enums wrapped in anyOf does not trigger auto complete.

Environment:

craft-ls: 0.4.2
python: 3.12.3
editor: Neovim 0.12.4
os: POP_OS 24.04

[Batalex]

Thanks for reporting, fixed in #37