# Description

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This PR adds fixes from LightWheel Labs and additional functionality to
the IsaacLab recorder.

Fixes # (issue)

- Fixes performance issue when recording long episode data by replacing
the use of torch.cat at every timestep with list append.
- Fixes configclass validation when key is not a string

Adds Functionality

- Adds optional episode meta data to HDF5 recorder
- Adds option to record data pre-physics step
- Adds joint target data to episode data. Joint target data can be
optionally recorded by users and replayed to bypass action term
controllers and improve replay determinism.


## Type of change

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- Bug fix (non-breaking change which fixes an issue)
- New feature (non-breaking change which adds functionality)

## Screenshots

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## Checklist

- [x] I have run the [`pre-commit` checks](https://pre-commit.com/) with
`./isaaclab.sh --format`
- [ ] I have made corresponding changes to the documentation
- [x] My changes generate no new warnings
- [ ] 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

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