# Description
This MR does the following:

- Introduces Quest retargeters for G1 env loco-manipulation tasks. This
enables lower body control via the quest controller joysticks, and upper
body control via controller tracking.
- Refactors the retargeters to *not* depend on OpenXRDevice, instead
move enums into DeviceBase and allow retargeters to be used across
devices.
- Adds XrAnchor "pinning" to a specific robot prim so that the XR view
follows the robot in the scene.

Fixes # (issue)

## Type of change

- New feature (non-breaking change which adds functionality)
- Breaking change (existing functionality will not work without user
modification)
- Documentation update

## Screenshots

Please attach before and after screenshots of the change if applicable.

## Checklist

- [x] I have read and understood the [contribution
guidelines](https://isaac-sim.github.io/IsaacLab/main/source/refs/contributing.html)
- [x] I have run the [`pre-commit` checks](https://pre-commit.com/) with
`./isaaclab.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 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

---------
Signed-off-by: Kelly Guo <kellyg@nvidia.com>
Co-authored-by: Hougant Chen <hougantc@nvidia.com>
Co-authored-by: Kelly Guo <kellyg@nvidia.com>