[python] Enable Unicode non-indexed columns

[bkmartinjr]

Issue and/or context:

Fixes #415

With the release of TileDB 2.14, UTF-8 is fully supported in Array attributes. Array dimensions continue to be ASCII only at this time.

Changes:

• Added support to provide differentiated Arrow/TileDB conversion for Array attributes and Array dimensions
• Allow UTF-8/Unicode non-indexed SOMA DataFrame columns
• Enhance unit tests to verify that value_filter functions correctly on unicode columns

Notes for Reviewer:

None

[johnkerl]

🚀

[codecov-commenter]

Codecov Report

Base: 70.07% // Head: 78.56% // Increases project coverage by +8.48% 🎉

Coverage data is based on head (793d97d) compared to base (98b588e).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #777      +/-   ##
==========================================
+ Coverage   70.07%   78.56%   +8.48%     
==========================================
  Files          70       30      -40     
  Lines        3586     2011    -1575     
==========================================
- Hits         2513     1580     -933     
+ Misses       1073      431     -642     

Flag	Coverage Δ
python	78.56% <100.00%> (-0.19%)	⬇️
r	?

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
apis/python/src/tiledbsoma/dataframe.py	97.29% <100.00%> (ø)
apis/python/src/tiledbsoma/util_arrow.py	92.98% <100.00%> (+0.12%)	⬆️
apis/python/src/tiledbsoma/collection.py	84.32% <0.00%> (-1.63%)	⬇️
apis/python/src/tiledbsoma/sparse_nd_array.py	94.06% <0.00%> (-0.85%)	⬇️
R/SOMADataFrame.R
inst/tiledb/include/tiledb/vfs.h
inst/tiledb/include/tiledb/core_interface.h
inst/tiledb/include/tiledb/dimension.h
R/SOMASparseNdArray.R
... and 35 more

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