[c++] Refactor SOMAArray and SOMAGroup to inherit from SOMAObject

[nguyenv]

Issue and/or context:

#2123

Changes:

• DRY: refactor SOMAArray and SOMAGroup to inherit from SOMAObject
• Set -mmacosx-version-min=11.0 to support usage of C++17 feature std::filesystem::path

These changes were picked out of #1817. I am opening smaller PRs to make it easier to review this time.

[codecov]

Codecov Report

Merging #2124 (cf0681d) into main (97625db) will increase coverage by 0.27%.
Report is 1 commits behind head on main.
The diff coverage is 59.18%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2124      +/-   ##
==========================================
+ Coverage   78.43%   78.70%   +0.27%     
==========================================
  Files         136      136              
  Lines       10759    10704      -55     
  Branches      209      211       +2     
==========================================
- Hits         8439     8425      -14     
+ Misses       2222     2177      -45     
- Partials       98      102       +4     

Flag	Coverage Δ
libtiledbsoma	66.97% <59.18%> (-0.28%)	⬇️
python	91.38% <ø> (+0.64%)	⬆️
r	74.62% <ø> (ø)

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

Components	Coverage Δ
python_api	91.38% <ø> (+0.64%)	⬆️
libtiledbsoma	48.34% <59.18%> (-2.13%)	⬇️

[eddelbuettel]

Looks good to me. One possible small enhancement but should work either way.

[eddelbuettel]

🎉