Use earthkit-utils

[sandorkertesz]

This PR moves the array backend/namespace code into earthkit-utils.

The change is backward compatible.

Remark

It is still possible to do this:

from earthkit.data import array_api

Previously, array_api was an alias to the array module in earthkit.data.utils. This module is now located in earthkit.utils, so it is imported from there behind the scenes.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 83.01887% with 9 lines in your changes missing coverage. Please review.

Project coverage is 90.85%. Comparing base (6a41bd8) to head (b412762).

Files with missing lines	Patch %	Lines
tests/grib/test_grib_backend.py	69.23%	4 Missing ⚠️
tests/array_fieldlist/array_fl_fixtures.py	72.72%	3 Missing ⚠️
tests/documentation/test_notebooks.py	50.00%	0 Missing and 1 partial ⚠️
tests/grib/grib_fixtures.py	87.50%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #672      +/-   ##
===========================================
+ Coverage    90.46%   90.85%   +0.38%     
===========================================
  Files          160      160              
  Lines        12217    12136      -81     
  Branches       595      593       -2     
===========================================
- Hits         11052    11026      -26     
+ Misses         983      930      -53     
+ Partials       182      180       -2     

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