Pass manifests to icechunk as pyarrow arrays

[TomNicholas]

Requires earth-mover/icechunk#1576

Does not yet give the benefits I hoped for

• Closes Avoid memory copies during serialization #860
• 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

[codecov]

Codecov Report

❌ Patch coverage is 30.00000% with 35 lines in your changes missing coverage. Please review.
✅ Project coverage is 71.78%. Comparing base (333070f) to head (dd01697).

Files with missing lines	Patch %	Lines
virtualizarr/writers/arrow.py	34.48%	19 Missing ⚠️
virtualizarr/writers/icechunk.py	23.80%	16 Missing ⚠️

❌ Your patch check has failed because the patch coverage (30.00%) is below the target coverage (75.00%). You can increase the patch coverage or adjust the target coverage.
❌ Your project check has failed because the head coverage (71.78%) is below the target coverage (75.00%). You can increase the head coverage or adjust the target coverage.

❗ There is a different number of reports uploaded between BASE (333070f) and HEAD (dd01697). Click for more details.

HEAD has 2 uploads less than BASE

Flag	BASE (333070f)	HEAD (dd01697)
unittests	3	1

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #861       +/-   ##
===========================================
- Coverage   89.18%   71.78%   -17.40%     
===========================================
  Files          33       34        +1     
  Lines        2052     2070       +18     
===========================================
- Hits         1830     1486      -344     
- Misses        222      584      +362     

Files with missing lines	Coverage Δ
virtualizarr/writers/icechunk.py	15.55% <23.80%> (-76.70%)	⬇️
virtualizarr/writers/arrow.py	34.48% <34.48%> (ø)

... and 14 files with indirect coverage changes

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