Xcompact3d-toolbox

Added
- `get_boundary_condition` at class `Parameters`. It returns the appropriate boundary parameters that are
expected by the derivative functions. by [fschuch](https://github.com/fschuch).
- First and second derivatives for stretched mesh in y, by [fschuch](https://github.com/fschuch).

Changed
- Syntax for `<da,ds>.x3d.simps` and `<da,ds>.x3d.pencil_decomp`. It is now possible to use them over multiple dimensions with just one call (for instance `ds.x3d.simps('x', 'y', 'z')`), by [fschuch](https://github.com/fschuch).

Fixed
- First derivative was incorrect when `ncl1=1` and `ncln=2`. by [fschuch](https://github.com/fschuch).

Fixed
- `param.mytype` was not updating properly [4](https://github.com/fschuch/xcompact3d_toolbox/issues/4), by [fschuch](https://github.com/fschuch).

Fixed
- BC parameters at ([param.py](xcompact3d_toolbox\param.py)), by [fschuch](https://github.com/fschuch).

Fixed
- [python-publish](.github/workflows/python-package.yml) action does not trigger if the release was first drafted, then published, by [fschuch](https://github.com/fschuch).

Added
- Support for stretched mesh in y, by [fschuch](https://github.com/fschuch).

Fixed
- `get_mesh`, by [fschuch](https://github.com/fschuch).
- `write_xdmf`, by [fschuch](https://github.com/fschuch).