Use ManifesStore to_virtual_variable directly in HDFVirtualBackend.

[sharkinsspatial]

• Closes #xxxx
• Tests added
• Tests passing
• Full type hint coverage
• Changes are documented in docs/releases.rst
• New functions/methods are listed in api.rst
• New functionality has documentation

[TomNicholas]

@sharkinsspatial I think I've been refactoring the exact same bit of code locally 😅

[TomNicholas]

Use this PR instead @sharkinsspatial

#543

[TomNicholas]

Why is this diff now 1000 lines?

[sharkinsspatial]

🤦 Uff. I seemed to rebase something incorrectly here.

[codecov]

Codecov Report

Attention: Patch coverage is 87.50000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 87.28%. Comparing base (fd2ccf3) to head (2ea03fa).
Report is 22 commits behind head on develop.

Files with missing lines	Patch %	Lines
virtualizarr/readers/hdf/hdf.py	85.71%	3 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #542      +/-   ##
===========================================
- Coverage    87.67%   87.28%   -0.39%     
===========================================
  Files           31       32       +1     
  Lines         1890     2092     +202     
===========================================
+ Hits          1657     1826     +169     
- Misses         233      266      +33     

Files with missing lines	Coverage Δ
virtualizarr/manifests/store.py	91.56% <100.00%> (+6.14%)	⬆️
virtualizarr/readers/hdf/hdf.py	94.25% <85.71%> (-0.68%)	⬇️

... and 10 files with indirect coverage changes

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