Fix 34

[juliettelavoie]

Pull Request Checklist:

• pre-commit hooks are installed/active in my local clone ($ pre-commit install)
• This PR addresses an already opened issue (for bug fixes / features)
  • This PR fixes Modify regrid function to allow regridding in many steps #34
• (If applicable) Documentation has been added / updated (for bug fixes / features)
• If a merge request has been made in parallel to this PR in xscen-notebooks, it is merged and the submodules have been updated.
• HISTORY.rst has been updated (with summary of main changes)
  • Link to issue (:issue:number) and pull request (:pull:number) has been added

What kind of change does this PR introduce?

• Add argument intermediate_reg_grids to ``xscen.regridding.regrid`. The goal is to regrid in many steps going through intermediate grids before regridding to the final ds_grid. You have to provide the argument for creating the regular grid and the arguments for the regridder for each intermediate step.

EDIT:

*Add argument moving_yearly_window to ``xscen.biasadjust.adjust`. This is necessary for ExtremeValues.

• Add align_on= 'year' in biasadjust. This is necessary for 360_day calendar. Do we want to make align_on an argument of train and adjust ?
• Add default coords=None in maybe_unstack_nan

Does this PR introduce a breaking change?

no

Other information:

[RondeauG]

This looks good.