A long overdue release of IsaacLab. Since we will soon have IsaacLab 2.2
out which primarily supports IsaacSim 5.0, this release marks a "stable"
checkpoint of IsaacLab that works with IsaacSim 4.5.

We are working towards improving our release cycles to have more
frequent patch releases.

- This change requires a documentation update

- [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
- [ ] I have added tests that prove my fix is effective or that my
feature works
- [ ] 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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Co-authored-by: Pascal Roth <57946385+pascal-roth@users.noreply.github.com>