Update create_grid args to improve usability

[jasonb5]

Description

This PR updates the create_grid API to make it easier to use. A create_axis utility function streamlines the creation of axes by generating a tuple of coordinates and coordinate bounds as xr.DataArray, This axis tuple can be passed into create_grid.

• Refactors create_bounds function
• Adds create_axis function
• Adds new x, y, z, and attrs arguments to create_grid function
• Deprecates **kwargs for create_grid function
• Closes [Feature]: Improve create_grid function #496

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• My changes generate no new warnings
• Any dependent changes have been merged and published in downstream modules

If applicable:

• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass with my changes (locally and CI/CD build)
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have noted that this is a breaking change for a major release (fix or feature that would cause existing functionality to not work as expected)

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (b46c331) 100.00% compared to head (3f6b646) 100.00%.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #507   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
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  Files           15        15           
  Lines         1517      1562   +45     
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+ Hits          1517      1562   +45     

Impacted Files	Coverage Δ
xcdat/__init__.py	100.00% <ø> (ø)
xcdat/bounds.py	100.00% <100.00%> (ø)
xcdat/regridder/grid.py	100.00% <100.00%> (ø)

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[tomvothecoder]

Hey @jasonb5, here's my code review. Most of my suggestions are related to formatting, docstrings, and comments.

Once addressed, LGTM. Thanks!

[tomvothecoder]

Thanks for merging Jason. Others can test the updates from this PR in v0.6.0rc1. I'll release that today!