NeXus support in `io`

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 90.15317% with 45 lines in your changes missing coverage. Please review.

Project coverage is 78.79%. Comparing base (2f1fd18) to head (53e2cf2). Report is 19 commits behind head on main.

:white_check_mark: All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
src/erlab/io/plugins/lorea.py	89.81%	11 Missing :warning:
src/erlab/io/nexusutils.py	95.56%	7 Missing :warning:
src/erlab/interactive/imagetool/__init__.py	93.40%	6 Missing :warning:
src/erlab/interactive/imagetool/core.py	75.00%	5 Missing :warning:
src/erlab/io/plugins/ssrl52.py	0.00%	5 Missing :warning:
src/erlab/accessors/general.py	86.95%	3 Missing :warning:
src/erlab/io/plugins/esm.py	66.66%	3 Missing :warning:
src/erlab/interactive/imagetool/manager.py	50.00%	2 Missing :warning:
src/erlab/io/plugins/kriss.py	33.33%	2 Missing :warning:
src/erlab/io/dataloader.py	83.33%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #64 +/- ## ========================================== + Coverage 77.88% 78.79% +0.91% ========================================== Files 66 69 +3 Lines 10744 11131 +387 ========================================== + Hits 8368 8771 +403 + Misses 2376 2360 -16 ```

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