refactor: move blob version as a table level config

[Xuanwo]

Close #5163

This PR will move blob version as a table level config instead.

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This PR was primarily authored with Codex using GPT-5-Codex and then hand-reviewed by me. I AM responsible for every change made in this PR. I aimed to keep it aligned with our goals, though I may have missed minor issues. Please flag anything that feels off, I'll fix it quickly.

[chatgpt-codex-connector]

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Codecov Report

❌ Patch coverage is 50.90909% with 54 lines in your changes missing coverage. Please review.
✅ Project coverage is 82.19%. Comparing base (8b3da7f) to head (9ee72ea).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
rust/lance/src/dataset/blob.rs	32.69%	34 Missing and 1 partial ⚠️
rust/lance-core/src/datatypes/field.rs	56.25%	7 Missing ⚠️
rust/lance/src/dataset/transaction.rs	33.33%	4 Missing and 2 partials ⚠️
rust/lance/src/dataset/write/insert.rs	70.58%	4 Missing and 1 partial ⚠️
rust/lance-core/src/datatypes/schema.rs	87.50%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5220      +/-   ##
==========================================
- Coverage   82.22%   82.19%   -0.03%     
==========================================
  Files         344      344              
  Lines      144687   144732      +45     
  Branches   144687   144732      +45     
==========================================
+ Hits       118962   118965       +3     
- Misses      21807    21843      +36     
- Partials     3918     3924       +6     

Flag	Coverage Δ
unittests	82.19% <50.90%> (-0.03%)	⬇️

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[westonpace]

This is good but I have one question about where this is going.