Initial version of Isaac Lab Mimic, based on the MimicGen paper and
code: https://mimicgen.github.io/.
The MimicGen workflow is useful for generating additional trajectories
for Imitation Learning, allowing training from a minimal set of
human-generated trajectories.

- New feature (non-breaking change which adds functionality)
- This change requires a documentation update

- [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
- [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: Ashwin Varghese Kuruttukulam <123109010+ashwinvkNV@users.noreply.github.com>
Signed-off-by: Kelly Guo <kellyguo123@hotmail.com>
Co-authored-by: Kelly Guo <kellyg@nvidia.com>
Co-authored-by: Peter Du <peterd@nvidia.com>
Co-authored-by: Karsten Patzwaldt <kpatzwaldt@nvidia.com>
Co-authored-by: CY Chen <cyc@nvidia.com>
Co-authored-by: Kelly Guo <kellyguo123@hotmail.com>