Refactor `ht.concatenate()`

[Shoham-M]

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

Description

Issue/s resolved: #

Changes proposed:

Type of change

Memory requirements

Performance

Does this change modify the behaviour of other functions? If so, which?

yes / no

[ghost]

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Legend

[mrfh92]

What I have done:

• resolved merge conflict with main in manipulations in favour of the new file
• added old concatenate-docstring and changed a lambda-function into a proper def-construction in order to let pre-commit run through
• removed test_collect from test_manipulations since collect has been removed from manipulations (I guess, because there is already a collect-function in dndarray?)

[mrfh92]

Now, it looks like that there are multiple errors for a single process (non-split arrays)

[github-actions[bot]]

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

[ClaudiaComito]

This should not be closed, I just assigned myself for review