Support basic xarray-functionality

[mrfh92]

Description

In this PR we add a class DXarray that is somehow similar to xarray.DataArray but with heat.DNDarray's instead of numpy arrays; whenever possible, we use existing Heat-operations or process-local xarray-operations.

So far implemented:

• class DXarray
• interoperability: .xarray() (DXarray to xarray), from_xarray() (xarray to DXarray)
• basic array manipulation: resplit_ (in place resplit of DXarray), balance_ (in place balacing of DXarray)
• miscellaneous: print

To be done (for the beginning):

• I/O (which formats?)
• basic statistics, or --more general-- functions that operate on the data part of a DXarray only
• checkout how more complex operations requiring interaction of data part and coordinates (e.g. interpolation etc.) can be done using xarray as process-local compute engine
• how to handle date-time-coordinates (pandas data frames)?
• ...

Due Diligence

• General:
  • base branch must be main for new features, latest release branch (e.g. release/1.3.x) for bug fixes
  • title of the PR is suitable to appear in the Release Notes
• Implementation:
  • unit tests: all split configurations tested
  • unit tests: multiple dtypes tested
  • documentation updated where needed

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[mrfh92]

@mtar I tried to change benchmark_main.yml, benchmark_pr.yml, and ci.yml in order to install xarray in the CI, but it did not work as expected.

[github-actions]

Thank you for the PR!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.10%. Comparing base (1263887) to head (960bf6f).
Report is 482 commits behind head on main.

❗ Current head 960bf6f differs from pull request most recent head 23e5cc6

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1183      +/-   ##
==========================================
- Coverage   91.83%   90.10%   -1.74%     
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  Files          77       79       +2     
  Lines       11191    10952     -239     
==========================================
- Hits        10277     9868     -409     
- Misses        914     1084     +170     

Flag	Coverage Δ
unit	90.10% <0.00%> (-1.74%)	⬇️

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[github-actions]

Thank you for the PR!

[github-actions]

Thank you for the PR!

[github-actions]

This pull request is stale because it has been open for 60 days with no activity.

[github-actions]

This pull request is stale because it has been open for 60 days with no activity.