# Description

This PR introduces a `variants` attribute in the `UsdFileCfg` which can
be used to set different variants when loading an asset from a USD file.

- New function `set_usd_variants` which applies variant sets to a prim
- New, optional `variants` attribute in the `UsdFileCfg` to specify the
attributes to be set
- Add variant setting in the `_spawn_from_usd_file` function

Fixes #401

## Type of change

- New feature (non-breaking change which adds functionality)

## Checklist

- [x] I have run the [`pre-commit` checks](https://pre-commit.com/) with
`./orbit.sh --format`
- [x] I have made corresponding changes to the documentation
- [x] My changes generate no new warnings
- [x] I have added tests that prove my fix is effective or that my
feature works
- [x] I have run all the tests with `./orbit.sh --test` and they pass
- [x] I have updated the changelog and the corresponding version in the
extension's `config/extension.toml` file
- [x] I have added my name to the `CONTRIBUTORS.md` or my name already
exists there