[WIP][c++/python/r] Pushdown SOMA object management to C++

[XanthosXanthopoulos]

Issue and/or context: Provide an alternative enum class to hide tiledb_datatype_t which cannot be forward declared.

Changes:

Notes for Reviewer:

[codecov]

Codecov Report

❌ Patch coverage is 96.80851% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 85.55%. Comparing base (4c2aadc) to head (78dd83c).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4436      +/-   ##
==========================================
+ Coverage   85.42%   85.55%   +0.12%     
==========================================
  Files         136      136              
  Lines       21441    20978     -463     
==========================================
- Hits        18317    17948     -369     
+ Misses       3124     3030      -94     

Flag	Coverage Δ
python	88.16% <97.70%> (-0.23%)	⬇️

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

Components	Coverage Δ
python_api	88.16% <97.70%> (-0.23%)	⬇️
libtiledbsoma	∅ <ø> (∅)

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